This may just be a quirk of how this sentence was written, but wouldn't ensuring agreeable views that were once removed not count towards enlarging the marketplace of ideas? It may never be totally free, but he doesn't seem to be contracting what can be in the marketplace.
> It's because he's enlarging exactly one segment, his own political views.
We'll see, but I think that a lot of people narcissisticly project beliefs on Musk that are exactly the opposite of things that they would like to see (and did see) censored (and a lot of fanboys who do the opposite.) Neither Trump, Musk or Putin are symbols meant to equally and oppositely oppose all that you support; you actually have to look up their opinions on things to have an accurate view of the world, rather than simply assume that they designed their opinions to be the opposite of yours. They don't know you.