datahoarder
Who are we?
We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
We are one. We are legion. And we're trying really hard not to forget.
-- 5-4-3-2-1-bang from this thread
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I think it would be very hard to argue in court that someone's ideas and thoughts that they made belong to reddit just because they posted them there. That is also why you can request reddit delete all your data and they must comply.
As for the legality of taking those comments and posts. I don't know for certain. The internet archive already does though. If anything, they would have to remove any content that a person wants removed that they made. Like a DCMA request.
Like with most things on the internet, if it is illegal and nobody is enforcing it, it might as well be legal.