No, I think that's absurd. People pay for all kinds of shit all the time, and it's silly to say that game developers are forced to do anything. They're certainly incentivized to try and make the most money possible, but that doesn't mean that fixed price digital or subscription games are exceptions. Every console platform has some kind of subscription service, and wouldn't be around if people didn't buy fixed price games. Blizzard and Activision's main cash cows are fixed price and subscription products (that also have additional superfluous purchases) and were just purchased for $70b. Ya there are a ton of super profitable free to play games, I play one of them, but I originally bought it before it was free. But it's not freemium exclusively.
Steam isn't mobile gaming. You're ten thousand miles outside the scope of the discussion. You might as well say that people pay for bread, if the point is that people do pay for some things.