It's not a scaling problem , it s a "reddit likes free labor" problem. They aren't going to give up on the small group of self-important idiots who named themselves mods 15 years ago and still havent quit, because they can't find new ones. No sane person will do such work for free in 2023 Trying to reason on the behavior of the mods is like arguing with the weather
We know some power-users are paid to promote things by advertising agencies and other special interest groups. We know some PACs are active in trying to shape public opinion on Reddit. I wouldn't be surprised at all if some of the moderators, especially the "powermods", are earning a living based on payments by some of these groups.
More plausible is that there are lobbyists or employees of think tanks who use reddit as one small part of their overall efforts. There are likely a ton of failed attempts to make something go viral, with the occasional lucky success. I can't see the time investment usually being worth it for anyone actually looking at results.
Of course, for those with money to burn who are too lazy for followup, someone they employ could be making money as a 'reddit influencer', but I just don't see them accomplishing much. Throughout the history of post-agricultural civilization, there have been dead weight positions eagerly filled by those more interested in easy money than taking pride in their work. It's like a lottery for the ethically challenged, and what they do is ultimately of very little importance to the rest of us.