They have no chance of breaking up Google’s web oligopoly. You could have your own browser and supports everything Chrome does and it still wouldn’t matter. What matters is getting people to use your browser, which is (so far) done in only one of two ways: control an existing platform so you can be the default (iOS, macOS, Windows’s, Android, etc) or spend a ridiculous amount of money on advertising (ex: Chrome on Windows). The implementation of the browser is irrelevant.