In many of the subreddits the mods are directly improving the site's contents through extensive manual filtering and moderation. Some subreddit mods also manually manage "flair" including various forms of "verification." There are may subreddits that would be effectively unusable due to spam and irrelevant content without such moderation. Some social media sites pay people to conduct this kind of filtering and curation, so it doesn't feel like a stretch to me to say Reddit mods might qualify here.

I'm not saying that there isn't a "common-sense" counter-argument to some of the cases I noted, but "common-sense" is a defense to be raised in court, the case is brought based on if the law could apply. In my mind that's troubling as it weaponizes the law in a way it could easily be abused.