Maybe because they don't believe it's the best route to go for them and their users? I'm inclined to agree, although I'd like to see the open web succeed, but I

Maybe because they don't believe it's the best route to go for them and their users? I'm inclined to agree, although I'd like to see the open web succeed, but I will weep if I have to use web apps instead of native apps for anything that couldn't be a website.