So in the enterprise world, it has been common for years for companies to "only support Chrome" even on iOS, where it's just skinned Safari. I have constantly had to call vendors mean names and point out how obviously iOS support means they are Webkit/standards-compliant. This is how I know, in fact, these websites will also work on Firefox. Apple's annoying iPhone monopoly is the last thing protecting the open web as needing to be standards-compliant.

The moment iPhones aren't allowed to force browsers to use Webkit (the EU is already pushing for this), the open web dies. There will no longer be any draw for web developers to develop for standards instead of developing for Chrome.