Forfeit is not the right word. Nobody is taking your business away from you, it's just not a profitable business.
> monopoly which youtube absolutely is
That is begging the question. There are plenty of sites that let you share video like youtube[0]
[0] http://www.freemake.com/blog/top-7-free-video-sharing-sites/
If you own a platform on which other people do business which is a natural monopoly, you shouldn't be allowed to regulate the content on that platform. Youtube is a natural monopoly. It's fairly obvious that this is so, but I will elaborate anyway.
The value of youtube is the number of people use the site. The number of people on the site encourages people to host their content on that site, more people hosting content on the site encourages more people to use the site. In this situation there will always be exactly one winner.
users can't easily (and sometimes at all) switch to a different internet provider, which is why net neutrality is important.
youtube just seems to be the most monetized platform for the time being, but i don't think it's anywhere near being monopoly in terms of access to users.
More importantly this doesn't address the concept, which is that it's dumb to attach motive to the definition of a problem. It's important when assessing criminal liability, but if you're just using it as an excuse to ignore the detrimental effects of censorship, which haven't changed, just because the mechanisms have, then you're just being profoundly counterproductive.