Earlier quoted context omitted.
> They don't because too many people pirate games to make that a viable business. Given how many games on Steam are sold either DRM free (you can just transfer the files over to another PC and they just work) or functionally DRM free (Steam's DRM is trivially bypassed, so one step removed from DRM free), this doesn't really scan. Other than games with Denuvo and multiplayer games, DRM is a non-issue for actual pirate…
Also, many such games are on gog DRM free, and certainly pirates don't care where they get their games.
The scene exists for a reason, it is a very trust based ecosystem.