The ultimate question would be whether anyone had the soft- or hard-power to stop them if they wanted to, which might be doubtful. But like @Monologue said, it wouldnt be in their interest. Keeping everyone tied to them and their services is far more profitable than actually using hard power to stomp out projects that steal comparatively little from their profit margins. But profit margins are profit margins, so further changes to make Chromium/Chrome even more of a spyware while booting out forks is just a double win.