next month they'll also style it like your browser's native address bar for a better user experience and intoduce a w3c standard API for hiding the real address bar. /s?
They have been trying to make it so that users can't tell if they are on real webpages or AMP pages, and it looks like they finally implemented it. AMP is about Google, tracking, and ads, not page speed, even if they have convinced many of their engineers that it's about page speed.