If you delete comments/posts they come back after a while.
Since comments/posts may include personally identifiable information that's a GDPR/CCPA violation. Not just a dick move this time, but also illegal.
it doesn't make sense to me that reddit has to remove messages when mailinglists don't because they can't. on some systems quotes are implemented as embedded links to the original message, so if the message disappears, the quote disappears. on hackernews quotes are copies that can't be removed.
why should personal rights go so far as to remove your contributions to a public discussion?
shouldn't that be limited to actually removing only the personally identifiable information that is embedded in the messages?
Technically, you would have to send a request to every party to delete all your PII.
A common theme is to set the user ro "deleted user".
As long as it is not associated with you it's fine.
Also you request deletion that the party and their contractors hold. So a mailing list may not show your name for past messages, but delivered mails are outside their perimeter/scope.