This isn't about some random 4chan troll. One of the wealthiest people in the world, now owner of a platform that hundreds of millions of people used to communicate can't be so easily ignored. That acquisition was itself an example of how he can insert himself into public discourse regardless of whether people care about him. A lot of the people now lamenting the decline of Twitter, especially the ones who rely on it for their career, didn't even use to think about this guy.
Most of the technology and social media landscape are dominated by proprietary software and corporate platforms. It's not like these people can flip it all around by themselves.
We are here on Lemmy but that doesn't change that there are far more people on your namesake's place, who aren't going to leave until it's completely unbearable.