Facebook appears to store the personal data of banned people indefinitely, you can log in a year from now and you'll be greeted with the same message. There is a link to download your account data, but they offer no option to permanently delete it.
Stripping you from your right to exercise control over your personal data is illegal in the EU.
They don’t stop you from exercising control over your personal data. Try sending an email or formal legal request to FB and see if your data is still there in 31 days.
You cannot access the link to request permanent deletion once your Facebook account is banned. The web is full of unsolved threads with people trying to find a way to permanently delete a banned Facebook account.
I have a Facebook account that was banned three years ago, and I just tried, I can still create a download archive with all of the personal data on it, with no way to access the account deletion capability.
Woops.
Maybe I should inform my country, who just passed GDPR-like legislation, that there is a test case against a company everyone hates.
The last published DPC audit found that it does [1]. There's not much reason to subject themselves to huge fines and lie about it, a very small fraction of facebook users delete anything.
Instagram doesn't seem to. I deleted my account a few years ago, but they still notify me with the updated terms of use. I assume my account is still there, regardless of GDPR.
Stripping you from your right to exercise control over your personal data is illegal in the EU.