I don't really like that Musk is buying twitter, and would prefer for it to just slowly die, for 2 main reasons:
1. Musk is basically a con artist. Virtually all of his major projects have either been outright, physically impossible lies (Starlink, Hyperloop, point-to-point rockets, solar-city, robotaxis that generate money, etc), completely overblown and underdelivered (Tesla self driving, reusable rockets, vegas loop, Tesla battery technology) or has just been rebranded products from other people (LG supplied batteries, etc). He also has plenty of vaporware that never came to anything despite being promised for release years ago (Cybertruck, Neuralink, Mars mission, Tesla Semi, that weird robot thing with the dancing mime). All of his enterprises are bleeding money and not profitable, with the exception of SpaceX which largely makes money by overcharging the US government for services, something which has angered many of the top people at NASA who see it as overpriced garbage. The only successful project he was tangentially involved with was PayPal, which fired him immediately after buying out his company (their competitor), before they were really successful, so he had nothing to do with their actual success. Given this track record, I feel like this Twitter purchase is more of the same, either a pure pump and dump scheme, or a network he will largely do nothing with and let stagnate while he uses it's net worth to prop up his other enterprises, keeping the scam going. Since he has a history of
not exactly supporting free speech, I wouldn't get your hopes up.
2. Even if Musk did have good intentions and did actually deliver on the perfect "free speech" platform, and turned Twitter into an actual genuine free speech platform, it still suffers from all the same problems as every other platform. Replacing a liberal, left-wing dictatorship with a right-wing one doesn't solve the underlying problems. Even if you had a perfect dictator who was completely benevolent, they won't be around forever, and they still have to follow the law, meaning Twitter can be, at best, revitalised temporarily, until the next idiot takes hold and changes the policies again, or the US government sticks their grubby little hands all over it. On any platform, left or right, there's no such thing as "free speech", the closest you can get is an administrator who happens to tolerate your views enough to permit them, which could change at any moment.
Twitter needs to die, and we need to replace it with decentralised, federated solutions, like Pleroma, Mastodon, etc. People keep saying blockchain is web 3.0, but ActivityPub is the actual web 3.0, and once it starts to really take off, only then will we enter a new era free of censorship and where individual communities can exist again without fear of being shut down. Twitter becoming popular again with conservatives actually works against that goal, so I see it as a net negative - we are propping up the bad system instead of replacing it with the better system.