nostr:npub1su4t3c2h2fl2ws6hfcnn5r7jdn87qvhvaafe5uv3hcwygxz3rjssf6a0dw And you better believe that the spammers are training up Captcha defeat AI's on data sets in order to enable automatic fake-person account creation at scale. 

These are fairly simple data sets to train on and and they don't even have to be right anywhere like 100%, just often enough to create enough account in little enough time as to be exploitable.