Sadly, this is not actually about antisemitism. It is about payment processing.
There are things that you simply cannot say on the internet and remain in business, unless you run the entire show.
If you cross those lines, banks cut you off. And without payment processing, you literally cannot run ads, because you cannot be paid.
This doesn't really have anything to do with covid though.
(What the one X'er said is ABSOLUTELY antisemitism, it's the "great replacement" theory.)
Musk lost hundreds of millions of dollars, for the equivalent of a "this" throwaway comment.