1. The largest code contributors to Linux are corporate contributions
2. Regular people who contribute to OSS do so as a passion project, as a hobby, and have other unrelated jobs that pay the bills. Those people still have to make a living, they're just not doing it from their software contributions. Journalism isn't a hobby and you can't work a day job and still be an effective journalist. News orgs don't come together as hobby projects.

I'm not defending advertising. I hate it and think it's ruined the web. I'm just addressing the analogy here wrt Linux.