Uhh… I guess it’s not technically DLC, but ConcernedApe is selling the game soundtrack for $5 on Steam. It’s in the game’s DLC category, but unlike some other soundtracks on Steam, it’s not dependent on owning the base game to purchase.
But it’s also downloadable content, so it is DLC… I guess it depends on how you want to define DLC nowadays.
It’s being sold via ConcernedApe on that Steam page I linked in my previous comment. So he’s earning the money from sales.