Idk, but I can’t imagine it being very effective. I don’t think most reddit users actually go into subreddits directly. I think most people engage on reddit through their front page and multireddits. When a sub puts garbage up it will just be removed from their multi reddit list or front page. Once the removal is done the content in the protest sub won’t be missed or seen.
I think RSS would be the best Youtube alternative. RSS works great for just about anything you want to broadcast. I don’t know why people refuse to use it for video.