That's pretty clever.
I think that these AI scrapers might be smart enough that this doesn't really work though - at least if I were designing them I'd have them all come from dynamic IPs and not have any of them bother hitting the same target more than once. These things are very dedicated to acquiring content without consent, and if they're capable of causing problems for (say) Reddit, I'm not sure my little website is going to have much luck deterring them.
Honestly a better strategy might be to just glaze everything I draw.