[DeLopSpot]

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

[hoppoy]

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

[DeLopSpot]

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