HooRU So are you giving those passengers 1 star ratings? Are you reporting them to Uber at all? Who is the “They try and trick us or pressure us into breaking the law”? The passenger or Uber?
The time and money that Uber spends to investigate is not your concern. Wear and gear on a rental car is not your concern either. That is their costs of doing business.
It sounds like you’re just going with it, accepting passengers against TOS hoping to profit. Not all money is good money, sometime you just have to take the loss early and learn from it. Giving rides to unaccompanied known minors is opening yourself to all sorts of possible legal troubles, least of which is getting fired by Uber for breaking their Driver TOS. Not reporting them is just enabling them.
Uber Teen Accounts allow for some underage rides, and you should be notified before pickup in those cases with right to refuse, but if you accept you still have to report problems with passengers.
Have you looked into being an Uber Eats driver?