AMP pages artificially delay the loading of non-AMP elements, including non-AMP ads by 1 second. This means if you want AMP, you better switch to an AMP advert

AMP pages artificially delay the loading of non-AMP elements, including non-AMP ads by 1 second. This means if you want AMP, you better switch to an AMP advertising network. Who makes AMP advertising networks and also gets to make the rules about amp.js that changes behaviour, and adds in arbitrary restrictions (like a 8 second blank page if you block Google's tracking javascript) at will?