Aren't Opera and Vivaldi just a re-skinning of Chromium?
If yes, then it probably won’t save you.
And here you have the actual problem with Chrome — unless you fork it and have resources to maintain that fork, its open source nature is absolutely irrelevant. And even if you manage to fork it, you’re not operating at Google’s scale so your fork will be irrelevant.
PS: I use Firefox on top of MacOS and works just fine for me ;-)