Today i found out we are not compliant with the GDPR. This is because just merging the account from <user> into GDPRAccount, does not mean all PII is deleted. Some extensions could hold PII that CentralAuth does not touch, or it could be ips.
https://github.com/miraheze/MirahezeMagic/blob/master/maintenance/PIIRemoval.php should be updated to initiate merging user accounts into GDPRAccount and deleting any PII.