I share the same name with a local TV star in my country. Even that is a PITA. Can’t imagine being named Mark Zuckerberg or Michael Jackson or anything like that.
At some point there were teenager girls calling me (no idea how they got the phone number). I started acting like they called the right person and there would be happy screams on the other hand. I guess the high point was that. I decided that might not be a good idea though. Would definitely continue if my “fans” were middle aged men.
I seem to recall when he was on TV he leaned into the joke ("not that Michael Jackson"). Of course that was long before the days random people could send abuse on Twitter.
He should at the very least ensure that there was some kind of liaison person at Meta for these not quite as rich (and certainly less obnoxious) Mark Zuckerbergs to reach in case of trouble with his service. This lawyer Mark should just have his account flagged with a huge 'Vetted, this guy is called that; leave it.' notice for any Meta algorithm or employee looking into it.
Answer the question: What would an asshole do? They would buy up their neighbors' houses to make an unapproved mega compound, buy up ancestral Hawaiian land to block communal land access, and do unlicensed shit without permits making their remaining neighbors miserable. So what is right by virtue is unlikely to happen because almost all billionaires are legitimized criminal aristocrats subject to a different set of rules than average or poor people who are killed in the street for selling loose cigarettes like Eric Garner.