Apparently they are not paid enough to deter them from cheating.

The history of white collar crime by execs suggests there’s not an amount that’s enough to stop cheating

Exactly this. Using automation, you could make $60/hr nearly two decades ago. Without automation, a few bucks an hour and a lot of your work was rejected for payment.

You don't think (some) millionaires or billionaires cheat?

By this logic nobody can ever be underpaid lol

Anybody who is working willingly and is aware of the job market rates.

The one does not exclude the other.

When is someone underpaid though?

When they could paid more in their current situation with a job they can both get and would enjoy the same amount.