Mozilla can't compete against Google. Any attempts of growing their marketshare by advertising is going to fail. Google will just outspend them. Then Mozilla will either go bankrupt or have to recoup their investment by jumping on the data collection train. I much prefer they stay sensible with their business modell and focus on being sustainable. Firefox will naturally grow as people start caring more and more about their online-privacy.
Same with any kind of new innovations or projects. I don't want to outright discourage them but I much prefer their current pace of doing things slow and safely. Because if we lose Firefox due to Mozilla taking some kind of gamble the alternative browsers remaing don't really seem appealing.