Sure, overly spamming websites is shitty behaviour. But blocking AI crawlers hurts you in the end. Guess what will replace SEO in the long run?
Maybe. But even if that turns out to be true, what good is it for the source website? The "AI" will surely not share any money (or anything else that may help the source website) with the source anyways. Why would they, they already got the content and trained on it.