I still find it very implausible that first mover advantage alone made Valve into a sustainable multibillion dollar company for so long with very little lock-in

I still find it very implausible that first mover advantage alone made Valve into a sustainable multibillion dollar company for so long with very little lock-in and very few anticonsumer practices. They have consistently outmaneuvered all their competitors for over a decade on multiple fronts. Their foray into hardware is just the most recent example. I think pointing to an outdated version of WebKit contained in the app is really grasping at straws for trying to find a way to make it look bad.