You yourself stated to us that Gmail team would implement AMP4Email as they wished. Did Outlook or Yahoo or Mail.ru have a choice in just telling you not to deploy AMP4Email? Or did you tell them Gmail was doing it no matter what, and ask if they wanted to not lose compatibility with 2/3rds of all email accounts on the Internet?

Suggesting any part of AMP is open still feels very disingenuous when you recognize the monopoly position of the company spearheading it.