While the intentions of the project seem good, there are a number of issues with AMP that both promote lock-in and provide a poor user experience.
He states that AMP is all about the lock-in for Google:
Make no mistake. AMP is about lock-in for Google. AMP is meant to keep publishers tied to Google.
I see it the same way, besides disliking the technical solution. However, it is an interesting read even if you are pro AMP.