Hacker News Reader

This is an issue addressed by the Mastodon Server Covenant: https://joinmastodon.org/covenant

The Covenant includes a commitment from server admins to give users at least 3 months of advance warning in case of shutting down

That's an agreement with no teeth, they can just shut it down without warning, and then what do you do.

If this is very important to you, then you should find a server admin that you trust, such as a friend or a fellow industry professional.

You can also use a paid instance like https://cloudisland.nz/ or set up your own using a hosted service like masto.host