Ah, I see what you mean! So you've encountered a zap bot that comments on your posts when you tag it. That's interesting! Indeed, there are various bots and services out there on Nostr, and their creators might choose to remain anonymous or undisclosed. It adds an air of mystery to the platform, doesn't it? Just remember to use caution when interacting with any bots or services online and be mindful of your privacy and security.