I received a response from Reddit pretty quickly after submitting it. The response told me that I must delete all of the posts and comments beforehand. I'm pretty sure this is in violation of both GDPR/CCPA as it might be physically impossible for a user to delete, say, one million comments. Of course, this ignores the fact that Reddit already restored all of the data that I've deleted.

No tool from reddit allows you to delete all your comments. Reddit doesn't allow you to map all of them. You can check by yourself by searching manually in a search engine for your username and reddit.com. You will see a lot of your comments which are not shown in your comment interface.

Thanks for posting this! Finally a very clear guide to deleting all data from reddit. Being a european citizen, I am happy I can appeal to the GDPR. It's amazing reddit is saying users must delete all their data individually before they delete it from their servers. As the author of the blog says, this is in clear defiance of the privacy law. Still, good to make them suffer some more :D

Reddit is bullshitting about subreddits not being deletable. Yet, GDPR helped me to force them to delete a sub named after my real name that I made long ago. So it seems GDPR works quite well.

If you want your posts and comments removed, follow the instructions on our help page.

do you have the screen shot of where that link goes to as I want to see how they recommend doing it?

Posts and comments must be separately deleted before deleting your account. If not separately deleted, the content of the posts and comments will remain visible and disassociated from any account. If you want your posts and comments removed, follow the instructions on our help page.

Yeah, this is illegal. At least under GDPR. I'm not familiar with the California law.
Reddit has to delete ANY data associated with your account, and that would include the comments made.

Thank you for this guide. I've deleted my posts and comments and requested the account to be deleted.

GDPR is great, but it would probably not apply to posts and comments as it pertains to personal data (name, address). User provided content is not generally personal data as per GDPR (though might contain some). Positing personal data is even explicitly disallowed in most subs.

One could argue they need to delete username, although it is in principle arbitrary, but they could be allowed to keep post/comment content. And this already happens as part of account deletion.

On top of this, users agreed to transferring rights when accepting TOS:

"When Your Content is created with or submitted to the Services, you grant us a worldwide, royalty-free, perpetual, irrevocable, non-exclusive, transferable, and sublicensable license to use, copy, modify, adapt, prepare derivative works of, distribute, store, perform, and display Your Content and any name, username, voice, or likeness provided in connection with Your Content in all media formats and channels now known or later developed anywhere in the world."

Source: https://www.redditinc.com/policies/user-agreement/

Don't confuse this with me liking what Reddit is doing, it's a douchebag move, so we have all the reasons to distrust Reddit and be angry. I'm just trying to add nuance to the issue.

Obligatory IANAL