Rhube, If you're on Tumblr, the AI scraping is being rolled out NOW NOW NOW.
You can turn on 'Prevent third-party sharing for [blog name]' to opt out.
You have to do this for each blog individually. It wasn't there for me at first, but when I navigated to my blog settings via View blog it updated - don't know if that was coincidence. Anyway:
On web: select Account > Your blog > View blog > Blog Settings
I'm off to see if there's anything I can do on WP. #tumblr