If the games you play are single-player (mine are), then simply run steam in offline mode to play your games. That way anyone sharing your account is unaffected

If the games you play are single-player (mine are), then simply run steam in offline mode to play your games. That way anyone sharing your account is unaffected. You can also use shady steam_api.dll replacements to not tell Steam you're playing at all (I'm actually quite glad something like this exists, I've been locked out of shutdown activation servers and other dead platforms in the past)