I feel like "old twitter" was sort of a marketplace of ideas -- you know, the thing right wingers are always clamoring for.  It was free and open, and the marketplace (a.k.a. the userbase) allowed good ideas to percolate and bad ideas to be ridiculed.  People with bad ideas didn't like this system because it didn't allow them to spread their bad ideas. 

Enter Elon Musk, prominent Nazi.  Musk didn't like the marketplace so he simply bought it.  He changed the structure from "free and open" to "pay to win" so that paying customers would have their voices heard more.  Instead of good ideas rising to the top, bad ideas bought their way in.  On top of that, engagement became the new currency, so the bad ideas with the most engagement dominated the marketplace.  Twitter's marketplace of ideas is now a swamp of shit with the absolute worst people and worst ideas on the very top. 

Critics will say Elon had to do something to make Twitter profitable.  That sounds reasonable, but I have my doubts.  Tech companies absolutely don't need to make money.  Most corporations don't need to make money.  Private investments, stock buybacks, corporate restructurings, and mass layoffs are how pretty much all companies operate at what appears to be a profit.  It's all made up and doesn't matter at all.  The point is, Elon destroyed twitter because he's an awful lunatic attempting to curry favor with the most despicable human beings on the planet.