An arbitrary technical limitation. You could preload any site you want. Google wants to push AMP, so they only preload those. Well of course it's cheating if y

An arbitrary technical limitation. You could preload any site you want. Google wants to push AMP, so they only preload those. Well of course it's cheating if you compare load times between pre-loaded sites vs. not preloaded ones. And then argue that "AMP is faster", which is obviously wrong because the conditions are not the same.