ISBNdb has never purchased, scanned, or sold a book — for AI training or anything else

Nobody is accusing you of that, but instead of facilitating it (or at least trying to) as an intermediary. You got caught red-handed, and now you're trying to pass it off as a "marketing experiment", you weasel. But at least you didn't double down and take down the entire platform with it, so I'll give you that.