That's the store. There are a lot of other things to consider in terms of being a competitor/alternative to Steam, both from the user/gamer end to the seller/developer end, where a lot of other competing products like GOG, ESG, Origin, UPlay, and so on could never reach where Steam is because Steam already has the biggest pie share in the market, dominate since the concept of a games client was a thing in the early days of PC gaming, and so they have a massive headstart with systems, designs, features, and continuously getting better with more improvements, systems, and features. No wonder no one can properly compete with them.
However, because of how #nostr works, if a competing platform were to rise up and have it built on nostr, then it would have the biggest chance to properly compete against it and get closer to feature/design/system parity, if not more, as the team developing it would have the global resources of every client and every developer working on their own clients on nostr, openly available and shared to them.
Turns out that open-source development on an open-source protocol was and is the only way to beat Steam, to beat mega-corporations.
By the way, I don't hate Steam/Valve, but if there's a chance to get something better, then I'm all for it.
#gaming