Those who engage in frivolous lawsuits are likely to be ordered to pay the victim’s legal fees by a judge. They are also likely to be exposed as exploitative to the people who surround them.
Someone like that had better be endowed with endless streams of money. This is so especially if their victim has an extremely strong countersuit. If a perpetrator of a frivolous lawsuit ends up losing in court with a big judgment levied against them and they’re not made of money - an embarrassing bankruptcy can easily be the end result.
Initiating a frivolous lawsuit is a way for someone to end up humiliating themselves to the public. If that person has a background in anything criminal whatsoever, the legal process may very well reveal the exact nature of those crimes.