Yes, it seems very hard to me to try to eliminate bots. To this day real human email goes to spam and bot messages go to the inbox. If giant, multi-billion$$ corporations can't figure out bots how will open source projects?

premitive1

nostr

NOSTR client - coloured verification check feature

Gjoni

I see you hat your saying but I think It would apply more of a cost to running a bot farm. 
You could even take this further perhaps and think of ways that a bot account can be identified and blocked and when this happens you could take the stake as a punishment? Applying penalties for running bots - guess this would be the hard part 