[untog]

AMP idea sounds good but it does not convince me that it is mandatory to include amp.js via CDN. Why not via bower or other package manager?

I think the point is that amp.js will be preloaded anyway, so including it in your package manager means it is downloading content it already has.

[fibo]

I don't get your point, I'll try to explain better. I mean, instead of an amp.js link to a CDN, doing in my project

. bower install amp

and serving it statically from my server. Why not? Maybe cause Google want to create an audience of people using AMP on their devices.

[untog]

Why not?

Because it's wasted bandwidth. AMP can easily intercept the CDNed version and serve a cached copy. If it's part of your bower build, it can't.