Using Chromium is a bit like buying chicken meat from a farmer because it gives you that nice feeling of "local fare" and "doing good"; meanwhile, the farmer sources that meat from the same gigantic poultry business that supplies all supermarkets, with chickens kept in squalid conditions.
Yeah, it's just about the fact that the overall negative system continues to be enabled by supposedly-virtuous actions. Google working in the open doesn't change the fact that in practice they can (and do) steer wherever they want, and promoting the monoculture enables their dominance and abuse of user-data.