This argument is fallacious because a real person, upon being sent a message, is not obligated to reply, irrespective of a mutual match having been obtained. B

This argument is fallacious because a real person, upon being sent a message, is not obligated to reply, irrespective of a mutual match having been obtained. By questioning the bot author over the morality of their methodology, your post appears to suggest that people who don't reply to messages would be equally perceived as having wasted the time of message authors, which is a view that your downvoters find troubling. That may not have been your intention, given your disclaimer and edits, but I can see why it could be construed that way.