Google in general doesn't like anything that intersperses an additional page between the searcher and their destination.
Part of that is user experience - their goal is to get the searcher to the information they need as fast as possible, and it's hard to slow them down more than by putting an additional page between them - and part of it is corporate strategy. Anything that helps organize the world's information - particularly information connected to a purchase, which is Google's revenue stream - is potentially competition.
I mean, I dislike broken AMP pages as much as any other user. But from the perspective of Google management, a broken AMP page is a bug report that you file with the relevant engineering team. An interstitial or aggregation page that some third-party puts up is outside of your control, and so you disincentivize it with product incentives.
Part of that is user experience - their goal is to get the searcher to the information they need as fast as possible, and it's hard to slow them down more than by putting an additional page between them - and part of it is corporate strategy. Anything that helps organize the world's information - particularly information connected to a purchase, which is Google's revenue stream - is potentially competition.