Not sure if you're serious, or if this is some attempt at satire?
If it's the former: Okay, it's great that you don't feel the temptation to spy on your users, but even the most basic understanding of human nature should tell you that this doesn't generalize to all (or even most) people and organizations that would run a messaging server, free or not.
I'm serious and I also know many operators of public servers. Unless you are somebody important/person of interest for various three letter agencies, no one cares for your messages. If you are such person, just run your own server and use e2ee. Other than that, enjoy the convenience and easy message syncing and server side search the unencrypted messaging brings.
If it's the former: Okay, it's great that you don't feel the temptation to spy on your users, but even the most basic understanding of human nature should tell you that this doesn't generalize to all (or even most) people and organizations that would run a messaging server, free or not.