Wrong, that is a loss of 10% market share. In other markets, a drop like that would put you out of business. Valve isn't dead, they're just a bit ill and if they don't go to the doctor and get their head checked, it will kill them.
> It's supposed to be self-organizing, just like the economy in the real word, which doesn't have a "vision" either.
This only works because billions of people participate in the economy. At that scale, it's mathematically probable that someone will do something great. Valve is too small for this to work, they need focus and vision.
> Factorio and Rimworld got popular through Steam.
False. Both of these games reached popularity before they were on steam.
Valve's moat is eroding. Between these games, Fortnite, and other mobile entrants, they are slipping.