Chrome is implementing a standard that pretty much all other modern browsers are also implementing. For example, service workers - implemented by Chrome initially and pretty heavily integrated into Android/PWAs - but Firefox and Safari are also shipping this feature currently. And also most features, such as service workers, can be effectively used with progressive enhancement, still providing a working experience to the user when they are using an older browser. Most sites I've seen that say "Must be used in Chrome" or whatever really have no reason to do that. There is more nuance to the progression of the modern web platform than the OP article gives off.