The browser exists in open opposition to iOS and Android, technically, culturally, and stewardship-wise. No-one in their right mind is going to pick a web host that charges you 30% of revenue. And yet, that's what Apple has managed to get (and they just control the BLOB distribution channel, they don't even provide runtime servers!).
The whole shebang is sorting itself out and I for one think it's going to be very, very cool.