I don't think startups would really get a boost, because when Youtube, Tumblr or Reddit have put new restrictions on what people can post I didn't see any users

I don't think startups would really get a boost, because when Youtube, Tumblr or Reddit have put new restrictions on what people can post I didn't see any users leaving for somewhere else. So I would guess that YouTube would have to remove many videos but users would stay there on YouTube.