This shit post gave me a visceral reaction. Half of RR is stealing ideas from videogames and making up for the lack of good story in them in the other half. At least what gets popular. That's assuming they don't do the over done and sloppy meta narrative version for it. Which at this point is lazy lampshading for Authors that can't make a protagonist that isn't basically just a stand in for the author and their "gamer" mentality.
But yeah no, indie games predate RR just like video games predate litrpg. But tabletop predates videogames, yet storytelling predates written medium entirely.
If I had to put it in words, RR went from being the coolmathgames, to newgrounds, to devolver digital(though not as fun). If we continue with the analogy, Kindle Unlimited is the Steam of indie books. Patreon paywalled web serials are the live service of the novel world. Sites like webnovel or anything that uses coins and fast passes are the mobile games with heavy mtx. Shout outs and the like are unpaid ads, not that RR hasn't already dropped the ball by making it necessary for authors to pay for ads to promote their "free" novel feeding back into the live service model.
Calling indie games the rr of the gaming world, elevates RR undeservingly while making it seem like indie games are all following saturated markets. You quite literally aren't looking at all genres so how would you know? Litrpg is fed from the same cash cow as rpg fervor is. The whole idea of a system based story isn't unlike a random kid picking up rpgmaker, some people can do some incredible stuff with it, but everyone else just uses what's on it to tell the same story.