Back here in reality, a poster child for "politically unpopular people being banned" was Milo Yiannopoulous, who was banned for leading a wave of anti-black abuse: https://www.vox.com/2016/7/20/12226070/milo-yiannopoulus-twi...
One could argue that Milo is the one who started the shift we've seen over the last 5 years in social media moderation decisions. He still has a platform, of course. There are approximately infinite platforms, and some of them are happy enough to host open racists. So we aren't at the "100 baby landlords decided to ban" stage yet. As you say, he's just been booted off the popular platforms. Because it turns out a lot of people are no longer interested in supporting open racists.
And it seems like that's where things will stay: Users and companies have unimpinged freedom of association. Racists, etc, have the freedom to build sites that support racists, which are mostly ignored by everybody else. This seems like a fine outcome to me. If it doesn't to you, maybe think about why.