It's common to blame the move from Twitter on Elon's politics. And that's perfectly valid. I moved away for a much simpler reason. He killed Tweetdeck for anyone not willing to pay $8/month. Regular Twitter hits you with ads (very disruptively), related tweets they know you want to see, and an algorithm that tries to get you hooked on hits of toxicity. Mastodon is pretty close to what I had with Tweetdeck, but less toxic due to lack of quote tweets.
Edit: Rereading this comment, I want to add that the things the author is saying make Twitter bad were to a large extent things we didn't have to deal with when we had Tweetdeck. That's not clear in the original version of my comment.