I wonder why Mozilla can’t make their own meta search engine like duckduckgo and start something like carbonads. It’s obvious that browser + search engine + ad

I wonder why Mozilla can’t make their own meta search engine like duckduckgo and start something like carbonads. It’s obvious that browser + search engine + ad bids are a money minting machine. Why is Mozilla not doing that? Depending on Google for revenue is a losing game no?