Heh, Steam for me was first just a new UI to Half-Life and my beloved CS. I hated the design but I liked where they were going with it. Being able to find mods, install mods, “shop around for mods” made steam what it is today. That, and beloved CS.
Also, if you can find it, in the Counter-Strike Beta, a lot of the levels had hidden community graffiti tags by the authors. It was awesome to see so many people. I miss the days of people coming together like that, building something they themselves want to play. Now everything is “how do I get rich off this?” loot boxes and shallow rewards for dopamine’s sake.