Regardless of Stallman's preferences, it doesn't seem like that's panning out very well. Fortunes are made every day by people and companies using OSS, but so

Regardless of Stallman's preferences, it doesn't seem like that's panning out very well. Fortunes are made every day by people and companies using OSS, but so rare is the open-source millionaire (or even sole operator eeking out a living) that they're largely exceptions that prove the rule. So, keeping software proprietary isn't strictly necessary for making money, but the correlation is so strong as to make any alternative interpretation moot.