We don't know that. Maybe Microsoft could maintain their own browser engine if Google hadn't provided one on permissive open-source licensing terms that met their needs.
MS can afford it financially. The desire to put in the effort to is not there.
This is why Apple really came out of the blue with Steve Jobs' razor focus on quality above all. Microsoft's goal is never to be 'best in class'. Because they don't need to be. People will buy it anyway.
Users, trusting the ad company that provides them free email, search, video, photos etc. will action on the suggestion and install Chrome.
More users gives google the market power to dictate web standards
The solution (to me) is simple - fix native app distribution. Make platform targets operate the same as they used to, and give people control over their computer again. The only ones preventing us from a platform-agnostic utopia is Apple and Google, both of whom profit off the artificial difficulty of distributing applications.
So, here we are. Google is poisoning the web while Apple refuses to swallow their pride. Everyone is hurting, and nobody stands to gain anything but the shareholders. A hopeless situation, but let's not pretend like everything here is morally grey.
Are people now using Edge because of this change?