Spam filters could do very little, because it's almost impossible to tell whether a conversation was run by a bot - and it's outright impossible to do so for a

Spam filters could do very little, because it's almost impossible to tell whether a conversation was run by a bot - and it's outright impossible to do so for a single response. However, you raise an interesting point: blacklists could reasonably be put into place. I'll make a merge request to use Spintax.