He can say whatever he wants, but buying one of the biggest social network to push his ideology onto billions leaves "freedom of saying whatever one wants" territory to enter "let's buy elections by controlling what enter people's feeds".
Thread’s notifications are just plain weird like it is usually clickbait where you can’t tell if they love Trump or hate Trump and if the one sexy cosplayer/alt fashion model I follow because I know her in IRL did something provocative with her friend who has tattoos from head to toe, Threads thinks this is front page news.
Twitter's fundamental issue is that it's entire pitch is "You can say the most outrageous things on the planet, share race-baiting videos, and be a scumbag as long as it doesn't anger Elon. Also, we're down with child pornography"
Which only energizes the most radical, fringe, terminally online, who happen to be the ones who were most disliked on regular Twitter in the first place.
See how that works?
Much of this has eroded over the years because of competitive platforms like Instagram but these initial conditions remain formidable.
Threads was started up because of the business opportunity of Musk fumbling things, but Bluesky seemed almost annoyed by all the new users.