One thing to keep in mind is that we probably all assume Twitter is bigger than it really is, but when you look at the monthly users, it has less users than Pinterest, and just above Reddit and...Quora?
4 out of the Top 5 are owned by the same company, Meta. If immense power by one voice is a concern (and it should be, no matter who), I think that should be much more of an issue than Musk buying #15.