But 99.9% don't care about running non WebKit browser, so it doesn't cripple 100% of users because they are not affected by this.

Same as having no Flash support today doesn't cripple 100% of iPhone users, because they don't care about it.

Go and ask your friends/parents/family/grandparents if they're crippled by not being able to run a non WebKit browser and listen to their answers.

I'm not making up numbers, I'm generalising it.

There's 1.5 billion iPhone users in the world, and there's ~26 million developers in world, that's less than 2% of 1.5 billion. Only a set of ~26 million developers have iPhones, even smaller set know the word WebKit, and even smaller set of those that know what WebKit means even care that their iPhone cannot run a non WebKit browser.

So yes, I can generalise and say that 0.01% of iPhone users care about non WebKit browsers. I can make it 0.1%, 1% or even 2%, it doesn't change the point - a minority of techies who like to tinker with their gadgets (including some business owners who want to increase their revenue) want to force their needs on 99% of people by exposing over a billion people to new security and privacy threats and attack vectors.

All while for the last 15 years they were happily piggy backing in the walled garden that was designed this way since day 1 and playing key role in Apple's success building a marketplace of 1.5 billion people that was unimaginable in 2008. And then suddenly 15/30% became too much, please change the terms we were playing along for 15 years, open up the iPhone!!