Poker rake back deals: are third party sites actually trustworthy

so i’ve been playing around with a few new rake back offers but almost all the good ones come through these third party sites i’ve never heard of. i get the basic idea - they track your play and kick you back a slice - but honestly it makes me kind of paranoid. it’s always some dude on discord or telegram with a spreadsheet asking for screenshots or account ids. just seems off even if i know a few regs that do it.

i try to keep things consistent and avoid headaches but it feels like i’m missing out not getting any kickbacks. is there an actual reliable way to spot which of these deals are legit? like what red flags are instant nopes for you all, or is it just the usual case of trust at your own risk?