I dislike AMP because the UX is bad and Google strong armed it in the news carousel anyways instead of focusing on performance for all sites, but this would be a lot more convincing with the source emails entered into the record.
edit: and this is just talking about ad content, right? Unless somehow a publisher made their entire page blocked until the page's ads load, throttling the load of ads would just make the ads load slower. And from what cletus quotes in another comment:
> To respond to the threat of header bidding, Google created Accelerated Mobile Pages (“AMP”), a framework for developing mobile web pages, and made AMP essentially incompatible with JavaScript and header bidding. Google then used its power in the search market to effectively force publishers into using AMP.
Is the claim that ads in AMP pages don't run javascript or do header bidding and so are "fast", but javascript and header bidding isn't inherently slow so Google could have made them faster (and/or not intentionally throttled)? I've never worked much with ads so maybe someone with knowledge of header bidding can comment.