The problem there is that there's nothing stopping the crazy instance owner from retaliating by "defederating" your own instance and cutting you off from your network.
>>bdw520+(OP)
He could defederate from you, but one for his instance. If you haven't pissed off the whole federation and you backed up your data (another thing you can do on mastodon) you'll be fine, and keep all your followers too.
>>bdw520+(OP)
Only if you have a single account. Most Mastodon clients allow multi-accounting quite trivially.
Also probably not the best argument to make in a thread whose main topic of conversation is about how one of the biggest social networks on the internet is disintegrating in real time thanks in part to the management of its owner.