So basically be suspicious of every single "free" or suspiciously cheap VPN. Go with known brands that come recommended by mulitple people, especially from people "in the know".
Though PirateSoftware (a person) has a good bit on why he doesn't advertise for VPNs on his channel.
What, you think they're leaving that money sitting on the table?
It's another thing to claim all of them are obviously corrupt.
Quick question for you - rhino poaching is a huge problem in Africa, with poachers getting a surprisingly small amount of money per rhino they shoot, because the buyers only want the horns. Do you think paying the poachers more to not shoot the rhinos would solve that problem?
Statements of categorical fact about a whole class of things (in this case VPNs) demand more than that.
You do you.