This sort of behavior from Google really is infuriating. How they can just decide to boot an app from the Chrome Store that is installed by over a million users is mind-boggling.
It's a pity that Chrome doesn't allow extensions to be installed from the new Edge store, like Microsoft allow Edge to install extensions from the Chrome store. With both built on Chromium, that could've potentially been a workaround (though you may want to consider adding this extension to the Edge store anyway).
Hopefully someone from Google will see this and stop the madness or be able to provide more details on exactly what needs to be done, though I wouldn't bet on it.