Nah, it happens with mangled names that no bot would ever try to stuff, too. E.g. I own derefr@gmail; but I sometimes receive email from people trying to reach

Nah, it happens with mangled names that no bot would ever try to stuff, too. E.g. I own derefr@gmail; but I sometimes receive email from people trying to reach a man named "Derek" — who almost certainly owns the address derek.fr@gmail, but probably typoed it once as dere.fr@, and now his browser autocompletes that into registration forms for him.