You'll usually hear DnD is like Marvel movies in terms of scope--but that's not quite right. In terms of number of games run on Roll20, from the 2021 Q3 ORR Report 50% of the games run on Roll20 is DnD 5e. Not even other DnD games or DnD like games (such as pathfinder) 5E alone is 50% of games played online1. Not even all of the Disney Films released in 2019 (which had Avengers Endgame) had 50% of box office shares.
So just this one version of this one kind of system is closer to the equivalent of if people considered Avengers Endgame literally the only movie to exist, and the only way movies and anything movie like should be made.
Also if Avengers Endgame was literally half of all box office sales of now until forever.
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This is about the only reliable data I can find (without a business account and paying) for RPG sales and numbers. No idea what it looks like in sales and money earned but I can't imagine its much different.
