Given the immense scale of Archive.org, there must be a truly incredible number of sites & pages with personal data & content in the pages. Millions upon millions of pages, due to the repeat archiving.
Comments with usernames. Comments with ip addresses (sometimes old comment systems would allow you to comment without registering but they'd show all or part of your ip address). Comments with personal information in the messages. Comments with email addresses. Blog posts with all sorts of personal details from the author. Personal user account pages, such as the kind you see on sites like Ask.fm or similar, with vast amounts of user information and personal details that can't be deleted. And on it goes. Archive.org is storing all of that and does not allow it to be deleted. Further, it would be nearly impossible to figure out what content is compliant and what is not within the archives. It's a giant GDPR violation system. Their only sane bet is to stay way from the EU jurisdiction wise as much as possible, or shut down.
Comments with usernames. Comments with ip addresses (sometimes old comment systems would allow you to comment without registering but they'd show all or part of your ip address). Comments with personal information in the messages. Comments with email addresses. Blog posts with all sorts of personal details from the author. Personal user account pages, such as the kind you see on sites like Ask.fm or similar, with vast amounts of user information and personal details that can't be deleted. And on it goes. Archive.org is storing all of that and does not allow it to be deleted. Further, it would be nearly impossible to figure out what content is compliant and what is not within the archives. It's a giant GDPR violation system. Their only sane bet is to stay way from the EU jurisdiction wise as much as possible, or shut down.