Are you saying email administrators are somehow above this all? They absolutely make weird personal choices when it comes to blocking servers and users. Microsoft will purge your account if it detects what appears to be a names child.

Take, for example, email delivery: if you're simply running a Tor relay (not an exit node) on the same IP address. You'll end up on a weird lists of blacklists not because there's any chance of abuse, but simply because they don't like Tor (or because they're too incompetent to distinguish between the two or too lazy to look up what those IP address lists mean).

The biggest difference between Mastodon and email is that you're less likely to interact with the petty administrators because people send fewer emails than they send toots. I promise you that free, community run email servers will be just as petty, shady, or unreliable as any hobbyist Mastodon instance.