If he wanted to kill it on purpose, he could have just shut it down. Maybe to keep the trademark he could have launched some other telecommunications service and used the brand for that.
Elon Musk is all about convincing people to act against their best interests to benefit him. For example, look at Tesla: it has a manufacturing capacity of ~2 million cars per year. Now look at Toyota: it has a manufacturing capacity of ~9 million vehicles per year. Now look at the market capitalisation of each company: for Tesla it is still about $535B, despite some fall from the peak in 2022. For Toyota, it is $416B (which is a record high).
So Toyota makes almost 5 times as many cars a year, but is worth 78% of Tesla? And the production capacity and value gap was even more extreme in the past? I think the question then is, what is going on?
The answer, of course, is Musk. He is very slick at convincing investors to act against their own best interests (usually by suggesting the possibility of things that happen to have the true objective along the way, like full self-driving cars by 2018 rather than competing with existing auto-makers, or 35 minute travel from San Francisco to Los Angeles, or a colony on mars rather than competing with existing satellite companies). This is the same skill-set as a confidence artist. I don't mean to imply that Musk has necessarily done anything illegal, but due to the similarity in skill set, and the large scale at which he operates, it would be fair to call him the most successful con artist in history. Looking at it through this lens can help to identify his motive.
So what would a con artist want with a social network, and why would he want to alienate a whole lot of people, and get a lot of haters?
Well, the truth is that a con artist doesn't need everyone to believe in them to make money - they just need the marks to believe in them. Con artists don't want the people who see through the con (call them the haters for lack of a better word) to interfere with their marks though. At the small scale - e.g. a street con, the con artist might separate a couple where one partner is the mark, to prevent the other from alerting their partner to the scam. But in addition to separating the marks from the haters, con artists use brainwashing techniques to create a psychological barrier between the marks and the haters. A Nigerian Prince scammer might try to convince a mark that their accountant can't be trusted. A religious cult con might brainwash followers to think their family are different from them, and if they try to provide external perspective, they are acting as the devil. They try to make the marks the in-group, and everyone else, even family and friends, the out-group who doesn't care about the in-group.
So what would a con artist in control of a social network do? They would start by giving the con artist the megaphone - amplifying everything the artist says to try to get more marks. In parallel, they'd try to get rid of the haters. They could shadow-ban them so the marks never see what they have to say, or they could put up small barriers the marks will happily jump over, and feel more invested in the platform having done that, but which would scare off the haters. However, the marks and the haters might still interact off the social network - so the scam artist would also want to create a culture war to try to make the marks hate the haters, and ignore anything they say, by amplifying messages hostile to the haters.
So what can you do if you don't want a world wrecked by divisions sewn just so billionaires can be even richer? My suggestion is don't buy into the divisions - work to find common ground with people, even if others are saying just to ignore them because they are different and will never get it, and get in early before the divisions are too deep.