mastodon : when you block another account they cease to exist and can no longer interact with your account at all ever
lemmy: when you block another account, the only thing that happens is you can no longer see or interact with that accounts past or future activity, though they can still see, vote, and comment under yours which, just like reddit, is ripe for abuse and doxxing
there can be no discussion of tolerance or free speech when there can be no way to block other abusive accounts from your content or you from harrasment