I run a small instance and I don't think this applies. New signups are closed on my instance, and the only way to get on is for you to ask me for an invitation, or for a friend of yours who's on the instance to ask for you.

If you look like someone who I'd be likely to kick off my instance, I won't let you on in the first place. It's a private garden that I let my friends hang out in, not a public park where I have to let some asshole who thinks me and my friends should all be dead come in and rant and rave all they like.

"Oh I am totally being de-platformed! Free Speech! Filter Bubble!", you cry.

And then you discover that the Fediverse is split into multiple parts, and that there are instances that are delighted to let you say anything and everything you want as long as it is not explicitly illegal. You can even run one yourself if you have a bit of spare change! You can say anything you like on your own instance, you can follow anyone your heart desires. And anyone on another instance can follow you if they like. But no other instance is obligated to listen to you.