Chromium isn't a win per se, Chrome is. Chrome users matter, Chromium users don't really do anything meaningful for them.
They get to push whatever tech they want as a de facto standard because now the web is Chromium or WebKit (and maybe Gecko)
But by having Edge and all the other chromium variants, including electron, they get to define what web technology is.
The technical achievements don't really matter as much as the value of having whatever 70/80% market share Chrome has. I'm not saying it's not impressive technically, just that they could've skinned Firefox and called it Chrome and put it on their google.com homepage and gotten a (multi)billion users as well in theory. As long as they could use it for the purposes of driving revenue, that would be a win as well, again in theory.
Same argument could be made for Android Open Source Project (AOSP) vs Android.