I joined a Mastodon instance with 3k+ other users and made several hundred posts.. until one day when login failed. Turns out the admin lied about a lot of things (like backups) and an unpaid bill wiped the machine.
Migrations are not possible when original server is offline, so I lost many months of content.
Running an instance by myself is no fun, community is the point. I see no obvious solution but wont personally ever touch another ActivityPub based social media.