For all of Musk's proponents' claims that this is a boon for "free speech", such free speech is anathema to corporate interests, particularly advertisers and corporate partners (we only need to look at the recent Ye + Adidas bustup).
Thus, it will likely devolve into "Free Speech (TM)", the my-way-or-the-highway speech policing that we see in places like /r/conservative where any criticism of Musk's preferred views is silenced. Again, we only need to take his own history towards criticism to see what Musk with a bullhorn is likely to do.
And, thus, we can only hope that it becomes such a cesspool of hatred such as Parler and other so-called liberterian free-speech platforms that it becomes toxic for investors and users, save for those who relish the echo-chamber.
One can dream.