I feel like this argument is in line with people who are against unions and tell employees of huge corporations "you can stand up to your employer on your own!".
The idea that even a fraction of YouTube's global audience would collectively choose to make an uncoordinated move - even over time - to something else because of YT moderation policy, is extremely unlikely, when compared to the coordinated marketing effort of YouTube to attract and retain viewers and content producers.
The coordinated side will always win here.
Other than important social issues, when has leaving things "up to the people" ever led to meaningful change?
It's hard enough when we're talking about actual issues that affect people, you think that choice of video platform on the Internet, a luxury if I've ever heard one, is going to shift because of some kind of popular movement?