They target toxic ads at people with poor mental health who are especially vulnerable. They do this intentionally because it's profitable.

There's plenty of reporting on this if you care to look it up. It "works" too. Spending more time on Meta products results in having more body issues, poor self esteem, and suicidal ideations.

But if I remember right you work for a big ad tech company and have previously gone to the mat to defend such practices, so I suspect you aren't genuinely asking.