This is very hacker-like thinking, using tech's biases against it! I can't help but feel like we're all doing it wrong against scraping. Cloudflare is not the answer, in fact, I think that they lost their geek cred when they added their "verify you are human" challenge screen to become the new gatekeeper of the internet. That must remain a permanent stain on their reputation until they make amends. Are there any open…
The internet has seen success with social media content moderation and so it seems natural enough that an application could exist for web traffic itself. Hosts being able to "downvote" malicious traffic, and some sort of decay mechanism given IP's recycling. This exists in a basic sense with known TOR exit nodes and known AWS, GCP IP's, etc.
That said, we probably don't have the right building blocks yet, IP's are too ephemeral, yet anything more identity-bound is a little too authoritarian IMO. Further, querying something for every request is probably too heavy.
Fun to think about, though.