Other games have lots of wacky skins and stuff but the Counter Strike games never had that and hopefully never will. Some of the unofficial servers are pretty wacky which is fine as they are unofficial.
I'd argue that the only reason Steam survived when it came out was because Valve forced people to use to play Counter-Strike. They've done better in the past 15 years though, I'll give them that!
CS is not a billion dollar game. CS is a fairly unprofitable game with a giant tumor of a marketplace attached, a significant point of which is being a faux currency that escapes most currency controls
I will admit that gambling $0.16 in skins on pro matches when I was 15 was a lot of fun. Maybe I'm lucky to have gotten away (relatively) unscathed, but I do have a little nostalgia for those days.
The CS2 Skin market-cap is above $5 Billion itself. The eSport scene is massive and one of the largest in the industry. The game is almost always the most played game on Steam.
Not sure where you are getting your idea that CS isn't a billion dollar game.
Would advise looking into why those skins are so valueable. spoiler: money laundering and hooking kids on gambling