He's also just genuinely made Twitter a worse platform. The
vast majority of Twitter's social cachet was based on people viewing tweets, or hearing about things happening on Twitter, without having an account there - Twitter's actual user-base was tiny compared to it's influence.
Now, if people can't view tweets without being logged in to Twitter, there's absolutely no reason to share them at all (i.e. this has led to r/worldnews switching to Mastodon links to share Ukraine war news, which in turn is a convoluted path of telegram and cross-posting from various sources).
The attempt to monetize the blue checkmarks showed very fundamentally he has absolutely no idea what Twitter's value actually was.