I see bots on #nostr in 3 different categories:

✅ Feed Bots - an account labeled as a "bot" that posts some data to their note feed. Users have to follow the bot account to see posts in their feed.

✅ Addressable Bots - bots you must initiate interaction with based on sending or including them in a thread. Dave AI bot or gambling bots are good examples.

⚠️ Stalker Bots - reply to notes based on keywords or user who posted note. Unsolicited automated replies and sometimes not even labeled as a "bot". Some LLM bots and automated airdrop often topic.

It is the third in this list that are an issue, since just as with email these posts are by definition SPAM. Aside from rate-limiting and blacklist npubs any other effective measures?