you can build all the expertise you want, it will not achieve much control or influence over what gets put into Chrome and therefore what power Google has to influence or just ignore web standards. The real power comes from voting with your feet and using a different browser altogether.
Building Chromium expertise could enable Chromium alternatives such as Vivaldi, Edge or Brave to selectively remove or override features that only benefit Google.
I'm wondering whether this is ultimately a more effective strategy if the goal is independence from Google's business model while offering a performant browser that works on all websites.
Mozilla has to put tremendous resources into implementing browser features that are uncontroversial and unrelated to Google's business model. And those resources are paid for by Google.
That said, there are certainly good arguments in favour of having more than one rendering engine. After all, privacy controversies are not the only reason why competition is healthy.
