I'm not sure I understand what you're saying here. Behaviors and emotions are descriptive of the "issue" part of mental health issues. Behaviors and emotions are the symptoms.
I think I'm not understanding your initial point - are you saying that these apps need to find people with mental health issues (which makes sense), or that these apps are incentivized to start inducing mental health issues in people in order to increase their customer base, and that's something we need to worry about?
I see in your initial comment, you talk about these apps diagnosing people and that causing somebody to develop the actual disease (I guess like a reverse placebo).
OP is trying to say you might have some tendencies that aren't problematic, but once you find a group who normalizes or somehow inadvertently encourages (i.e. via searching for profits) those behaviors that it turns into a real problem.
Whether that set of behaviors is just a behavioral problem or a diagnosable disease, I'll leave that to the experts.
