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Free and open source software does not discriminate based on political ideology. Unlike Twitter, which is a single instance controlled by a single corporation, Mastodon allows each instance operator to set their own rules. Each Mastodon user can choose the instance (or instances, since most Mastodon clients support multiple accounts) to register their account on.

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So is the only meaningful difference the scale of an instance? If a single Mastodon instance becomes Twitter-size, then its owners will have the same power over the users and will face the same challenges as the current Twitter? They won't be able to ban users cross-instance, but if they ban you on that instance, wouldn't you have to create a new account somewhere else (i.e. start from zero).

Mastodon will not evolve into a single-instance monolith like Twitter because fediverse users are too diverse to agree on a single set of rules. Some instances are general purpose while others focus on specific topics. Some welcome certain types of content while others don't.

If you choose an instance with rules that you agree to follow, you're not likely to be blocked in the first place. But if your Mastodon account is blocked on an instance, it's easy to make a new one on a different instance. There are many other instances to choose from and you can regain your social graph by following everyone again.

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