In case that ever goes south you can download almost any SteamDRM game, replace SteamAPI.dll or SteamAPI64.dll with Goldberg's Steam emulator's version, toss a text file called steam_appid.txt with the games app id (the number on the games storepage), and play the games just fine.
All it requires is having the vanilla game files. Games that use further DRM solutions on top of SteamDRM may require other steps (if the game uses SteamStub Steamless is the solution) but most steam games don't.
I'm familiar, I've been using it to play a friend's copy of Elden Ring. In this case though, we literally use the same steam account, he just sets it to offline mode since he only plays singleplayer games.
We're on good terms, I'm mostly joking about losing access. He's too old and entrenched in conservativism for me to want to waste the time arguing with him.