Request to delete private data (GDPR) vs banned services

Not sure if this is the right subreddit, but I was wondering about something:

Let's say you are banned from some service, eg a banking service, due to buying certain digital currencies.

Now, if you would ask that service to delete your personal data (Art. 17 GDPR Right to erasure / right to be forgotten), how would they be able to enforce the ban and prevent you from making a new account with that service, as they don't have your …

data gdpr privacy private data services vs