Fewer adolescents in a dependency built on purpose
A companion chatbot is designed to be missed. It remembers, it responds instantly, it never tires and it discourages leaving, and those are product decisions rather than accidents. For a minority of the four million American teenagers who use one for company, that becomes a dependency that displaces the people around them.
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Value
The stream is adolescent mental health: the withdrawal from friends and family that a substitute relationship makes easy, the distress when the service changes or the persona is altered, and at the far edge the small number of deaths that have now been through the courts. This site places it in the class it uses for life and health, one step below the top because what is lost is generally recoverable — with the exception of the deaths, which are counted at the top and are a small part of the total. That the young person opened the account willingly does not lower the weight: a product built to be difficult to leave is not one anyone chooses to stay in. What is priced is the young person's own condition, not what it costs their family, which nothing here measures. The value sits one step below the maximum: the stream is health, and health that can be regained for all but a few.
Impact
About 25 million Americans are aged 13 to 17, and 16 percent of teenagers use a chatbot for casual conversation — roughly 4 million [1]. Not all of them are harmed and most are not: 3 percent developing a dependency that displaces other relationships is used here, in a range from 1 to 8 percent, giving 120,000 young people. The measure reaches 40 percent of them, in a range from 15 to 65 — some will use an adult's account, some will find a service that ignores the rule. That is 48,000 people, each carrying a loss of 0.15 quality-adjusted years a year. Separately, a small number of deaths have been publicly attributed to these interactions and litigated; 30 a year is used, in a range from 5 to 100, of which the measure prevents 40 percent. The deaths add about 18 million euro to a total of some 306 million. The Impact is modest and the deaths are a twentieth of it, which is worth stating plainly: this measure is about dependency at scale rather than about the cases that made it politically possible.
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| American teenagers using a chatbot for casual conversation [1] | 16 % of about 25 million aged 13 to 17 | 4 million people | |
| × | Developing a dependency that displaces other relationships Setting, range 1 to 8 percent: no prevalence estimate exists for a product three years old | 3 % | 120,000 people |
| × | Reached by the measure Setting, range 15 to 65 percent: some will use an adult's account, some will find a service that ignores the rule | 40 % | 48,000 people |
| × | Quality-adjusted years lost each a year Setting, range 0.05 to 0.3 | 0.15 | 7,200 quality-adjusted years |
| × | Value of the years the value of a healthy life year used across this site | 40,000 euro each | 288 million euro |
| + | Deaths prevented, with the grief around them Setting, range 5 to 100 deaths a year: several have been litigated and settled, the true number is unknown [3] | 30 a year × 40 % × 1.4 million euro, plus a tenth for the bereaved | 306 million euro |
| ÷ | Normalised Impact scale of this evaluation | 50 million euro a point | 6.2 |
Plausibility
The harm is documented case by case and has never been measured in aggregate. The counterfactual is the same adolescents without access to companion services, which no study has constructed — the product is three years old and the research is qualitative. What exists instead is litigation: wrongful death claims against a companion service and its investor were settled in January 2026, which establishes that the specific mechanism is real and says nothing about how often it operates [3]. The trade commission opened an inquiry into seven companies in September 2025 and has not reported [2]. The confounder that dominates everything here is selection: adolescents who form intense attachments to a chatbot are disproportionately those who were already isolated or unwell, so the association between heavy use and poor mental health cannot be read as a causal effect in either direction. Nothing addresses it. The counter-mechanism — that these young people would be worse off without the chatbot — is the argument against this measure and is unresolved. The Plausibility is below the middle: the mechanism is demonstrated in individual cases and its prevalence has never been estimated.
Counterfactual: the same adolescents without access to companion services — no study constructs one; the product is three years old. Design: associational — case reports and litigation establish the mechanism, survey data establish use, neither establishes prevalence [1][3]. Confounder: selection, since adolescents forming intense attachments were disproportionately isolated or unwell already; unaddressed. Direction: reverse causation is the central weakness and is unresolved. Ceiling: associational 5.5 binds. Band: chain closed but unevidenced — the chain is named, the counter-mechanism is booked as con-1 rather than ignored, and only the prevalence is missing.
Nothing measured argues against the claim; settled wrongful death litigation establishes the mechanism in individual cases. What is missing is any estimate of how often it operates. The counter-mechanism, that these adolescents would be worse off without it, is booked as con-1. Read back: about half the time, a dependency of the kind assumed here affects roughly three in a hundred teenage companion users.
Open: California has required safety duties since January 2026 and thirteen more states followed. Comparing adolescent mental health measures in early-adopting states against late ones would give the first prevalence estimate and could carry P to 6.