Because PC gaming is a completely different mindset
Cloud gaming, like console gaming, is melt on couch and click play and you are done.
PC gaming is sitting in the pc chair, closing browser tabs and downloads, installing, changing the configurations, starting the game, seeing it is not on the optimal settings, changing settings, restarting the game because it needs for the settings to take effect and repeat 3 times. And then you discover that your controller stopped being accepted by the game after the 5th restart