While I would not agree to this...
... as it vastly depends from your definition of "fine" I clearly agree to that:
It is not dying. Musk can easily afford to pay for it out of his own pocket if he wishes. He deliberately changed the character of the platform - some like this, some don't. So if the change made it a better platform is up to own taste.
My personal perception is that is has gone worse up to the point where it doesn't deliver value but does harm and is outright dangerous. Seems I am not alone with this perception. Others call this "free speech".
What cannot be denied is that the richest man in the world has bought himself a communication platform with a wide, worldwide audience and can do withit whatever he likes. He has changed the policies and he has changed the algorythm. How it works is a secret - so it is very well suited to be (or become) a propaganda tool that enforces messages that he likes and silences messages that he dislikes - I would not call this exactly "free speech". Proof is there that this happens and happened already (as outlined further above in this thread).
Some of those who enjoy the new Twitter did, as they state, not know or use the old version before musk. I am not a intensive user of social media. No Facebook, no Instagram etc. for me. But I do have a Twitter account for 10 years, so a bit late to the party but many years before musk. Did not post often there and have stopped completely in the meantime, but still reading. To me the change of the platform is obvious: From a platform that fostered exchange of opinions (though sometimes rough exchange) and had a broad range of different opinions and topics from science over politics to humor it has turned into a mudhole of aggressiveness. Science has left almost completely, official politic and other institutions have also left for the bigger part and what's left is yelling and disinformation to a huge degree plus scams and porn bots and russian propaganda bots - all of which was not present before Musk came into play. Right-wing opinions are overly pushed by the algorythm, other voices are silenced. It has become really tough to get trustworthy information on Twitter - which used to be one of the biggest benefits of the platform as it was faster than traditional media. It still is but fake news and propaganda have vanished that advantage to a huge degree. And the general aggressiveness constantly rises the question why one would still use the platform even read only - many, including me, have stopped posting anyway because of it. People freak completely out for no reason, most of them do have blue checks, so payed accounts (which get better promotion for their messages). I.e. just today BMW UK, so the Bristish distribution of BMW announced that they would leave the platform. This was the result:
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Sure - that's free speech. But what benefit would I have reading this hateful postings. US People claim they would sell the BMW they just bought because the British sales daughter company of BMW does no longer post on X and others state BMW would obviously not need conservative customers.
Again: Free speech - but an amount of outrage that is in my eyes just silly. Seem to be really fragile egos involved and a clear "either you share our opinions or you are an enemy" attitude. Note that all those posters have the blue hook.
So from being a pretty tolerant information and discussion platform Twitter has turned into a propaganda platform for rightwing, extrem right and russian bot platform where these opinions are not only amplified but others are silenced aggressively with the effect that only the extreme rightwing opions, the disinformation and the hate are left and people are confirmed in their existing opinion through that filter bubble and become more and more extreme in their opinion: They believe that everyone shares their opinion. All of that deliberately created and orchestrated by an authorian billionaire using secret algorythms.
Some call this freedom or free speech - I do have my doubts. So some would state "Twitter is doing fine" - others not so much.