Sony and Microsoft’s Xbox will ban you immediately for this but because Steam is a lot more consumer friendly people do sell whole accounts with a game or two tied to them. There’s a site (that’s kind of shady ish so look out for that) that I have used called G2A that you can buy whole steam accounts with games on.

I think that some of those codes are stolen though or something of that nature but steam doesn’t do anything about it but that is 100% speculation on my part. I thought I heard a dev of a game say something like that one time though that they’d rather you pirate it than buy it off G2A.