That's in part why the enforcement of the "no reposts" rules and their conditional counterparts is so selective, having the ability to allow/deny these on increasingly large subreddits effectively amounts to running a money printer as you can then pick and choose who is allowed to karma farm, or direct userbases to their hustle culture bullshit reselling pokemon cards, watches, shoes, or bots to do this, etc.
This is also why there is often so much frankly insane drama over moderators getting catfished, outed as pervs/creeps, etc especially after a genuine subreddit with solid original content gets "too popular".
There are also weird second order effects, especially in places like popular subreddits for games, where selectively allowing what complaints actually make it to the top of the sub are utilized by those who make disgusting amounts of money from botting/farming the game to sell in game items or currency for real money, to create what looks like a genuine public outcry for balance changes or features that seem fun/good on paper but at the end of the day only exist to make it easier for them to get more items to sell. This practice has roots predating reddit, back when everything was still forums and the RMT markets for titles like Diablo 2 were in their infancy. Earlier this year an RMT account for Path of Exile was finally banned, you can find videos where people go through archives of what they had on hand when it happened and tally up prices, no bullshit millions of dollars in total value.
I learned a lot of this firsthand by getting involved in a city subreddit when I first moved out on my own, some people found out I could code well enough and tried to pay me a lot of money to assist them in creating these kinds of farms/influence operations. I obviously declined, this is all so fucking stupid! A few of them flew too close to the sun and made millions of dollars through ad programs on places like facebook, used what they could to pay off their college loans, buy a nice car, and then lost their asses in court and declared bankruptcy after giving most of it back.