[aeorgnoieang]

This is a good point I haven't run into before (which is itself frightening). So what could they do instead? Could they retain the actual 'read later' content, associated with their EU users, but delete all of their own personal data for now?

[princekolt]

Not much. If you're not compliant, you're not compliant. However, that's not the end of the world right there. GDPR takes ill-intent into account, and it also requires warnings before any punishment is applied. They should instead have started working on compliance before they actually did.