I can't imagine that AMP would load much faster that the current Daring Fireball design. If it's faster, I would probably guess that it's just the different routes between the AMP cache on Google and Daring Fireball's host. But, DF isn't using AMP.

I seem to recall that publishers who used the Facebook version saw a decline in revenue, so I think you're right about that point. I don't know about AMP, though.