Microsoft just did whatever they wanted with the web "platform", and so will Google.
In Microsoft's case what they wanted was nothing. They weren't a web business, saw it as a threat to their platform leverage, and so just left it abandoned and stagnant for years.
Google is simultaneously better and worse: they won't leave it stagnant because the web is their platform, but on the other hand they have a lot more to gain by abusing control of it.
We already have a number of Chromium based browsers that go against some of Google's most fundamental interests (e.g Brave).
The same thing has happened to Linux which was ok as long as it was chasing commercial Unix, spawning POSIX even; but look what happened with systemd, wayland, snaps/flatpacks, Docker, k8s, and all the other erratic developments - all the while not a single end-user app was created in the last decade.
This is the tragedy of the Linux Desktop. The problem with F/OSS is the "Free" part (as in "Beer"); as long as users resist paying for software, you will never have a rich enough ecosystem to develop that very software. The problems you list with "systemd, wayland, snaps/flatpacks, Docker, k8s, and all the other erratic developments" is that they are largely meant to solve corporate problems.