What is stopping Google from rejecting the pull request?
More and more I'm convinced the alarm is just due to a bad mental model of how code works. There is no pull request, there's just Microsoft building whatever they want.
If Microsoft doesn't completely fuck up privacy again there won't be any more reason to switch to Chrome.
Okay, so what effect does Edge moving to Chromium have? If you didn't care about Edge due to its marketshare then why does it matter what engine it uses?