I'm not sold that avoiding Chromium is any sort of win. It seems to be BSD licensed. The code comes from a long and storied OSS tradition. It is unclear why that having multiple different browser engines is strategically important. As far as I know we've long left behind the world where a hobbyist project could reasonably expect to implement modern JavaScript. Brave's existence and success suggests that competitors b…
The problem with Chromium is that it's controlled by Google. Given they control the engine in the majority of browsers, they get to call the shots on the direction of the web as a whole.
But even if Chromium was at 100% market share they couldn't control the web. If they start throwing their weight around then the other web companies will start organising around a Chromium fork. The important thing here is OSS/not-OSS rather than market share. Market share can change quickly enough in response to problems. It is like GCC - there was that spat back in the day, someone forks the code and there is a little war until people figure out which is better. Then the better version became "GCC".
It is fine to have one custodian as long as the actual power is retained by the users. Efficient, even.