The two cases (YouTube and using nonfree OSes) are not comparable as the grandparent poster and this suggest. In Stallman's case there were no free software OS

The two cases (YouTube and using nonfree OSes) are not comparable as the grandparent poster and this suggest. In Stallman's case there were no free software OSes. One could not use a computer in freedom. Therefore he used a nonfree OS to write free software until he could run a free software OS and thus had no more need for nonfree OSes. For years now he (and the FSF) don't run nonfree systems. They even endorse computers (and other computer hardware) that can be run completely in freedom (see https://www.fsf.org/ryf https://www.fsf.org/ryf for details). We already have file hosting options that don't use DRM, nonfree JS (or indeed any JS), and avoid the other problems of YouTube. There's no need for coming up with something new as we already have viable other means of sharing files. We don't need YouTube, they need us. By buying into their limitations and restrictions uploaders endorse YouTube (which is undesirable and certainly not very thoughtful) and help foist YouTube's choices on others (which is unethical).