My understanding is even without fame, if you get anywhere interesting in the business world you'll need to get comfortable with litigation. Every wealthy person is entangled in it, even people you've never heard of that "only" have 50 million.
If they invest in real estate, other businesses, etc? They're going to be involved. I'm sure there's some exceptions.
The people who do best with Fame are like Bill Clinton, who ignored impeachment and went on to be a popular ex-president. You have to be able to compartmentalize. If you're the sort of person who takes things personally, let's things get under your skin, well, I think the public life is simply not for you.
They just gather whatever random evidence they can, from news paperclips to emails and then threaten big companies.
Then quickly settle for ~700k-2M as a cash grab instead of going to court. Majority of big companies pay up instead of going to court.
To cut costs, these firms also operate on only free interns and maybe have 1 or 2 actual lawyers.