I'm in no way an expert, but IMO there is a major misconception in the free-ish software community that profit should be at most secondary to offering a fair and as good as sustainably possible product. I strongly disagree with this. IMO developers of free-ish as in freedom products OWE it, not only to themselves, but their community to be as profitable as possible within the rules they think that should be followed…
Profit from advertising is highly corrosive and corrupts everyone it touches (social networks, your tube, search etc etc).