No, they'll delete the data and say they have none.

Not to be that guy, but do you have anything to back that claim up? I'd love to know if it's actually true or not; it seems like GDPR is often used as a catch-all magic wand for "I want my data therefore the company has to give it to me", but I'd love to know if it actually applies in the case of a terminated/suspended account and/or an account found to be in violation of the service's terms & conditions.

You could just link to your comment:

https://news.ycombinator.com/item?id=21248111

(I assume that's the one you meant. "Ctrl-F" is very vague when you have a bunch of comments in this thread.)

Apologies - on mobile, it was tricky to get the link without losing context - and I thought that the info was relevant.