MastOdon (capitalized o for spelling visibility) is not end to end encrypted. Nothing you do there is private. Either you trust, or you don't. So as the other commenter said, self host is the only way to ensure privacy on mastodon.
There was in fact a recent event where the FBI raided mastodon admin's server and got their DMs, posts, and all private and public history of all users registered.
yup, it is, i was aware of that, i was just noting that it is possible to extract this information and pointed at the precedent. Thank you for clarifying anyway. Useful.