I can see arguments why Google needs to compete against Facebook: Those two compete for advertising customers. Funding one, two, a few browsers makes sense if the goal is to keep eyeballs on the web rather than letting Facebook tempt them into a walled garden. But why would Google care which of the browsers has most success? And if Google doesn't, why would regulators care?
I don’t know if Microsoft has any other motivation for Edge other than being the front end for Bing.
I am asking why people (appear to) think that Google's own browser is competing against the other browser that Google also funds.
I may be stupid here. Please excuse if so. But I don't see why Google would lose market share in a market that provides income if Firefox' market share were higher and Chrome's lower.
Because they'd get less tracking info and have a harder time tracking people across the web? That seems the biggest point here.