All Internet 'speech' is hosted by third parties,
Well, actually if fixed broadband internet service providers respected the last sentence of paragraph 13 of FCC's 10-201 Report and Order Preserving the Open Internet, then no, each and every end user as well as edge provider could host whatever services and applications they want to on the 'general purpose technology' of the internet (now that IPv6 has solved the address shortage issue). Unfortunately Google and all the other residential ISPs are playing protectionist games with their non-ISP commercially competitive server hosting businesses. If you want to read more, recently an internal Googler leaked comments between Larry Page and Google's CFO. Apparently Page is pretty annoyed by the current situation (as I am)- http://slashdot.org/comments.pl?sid=3106555&cid=41288357
P2P infrastructure depends on peers wanting to connect to you. If you're seen as 'toxic' then noone will.
This may sound like a good point for the general case when considering this video with the allegations of dubbing and fraud. But it wasn't so long ago that all of these same issues applied to the South Park episode featuring Mohommed. One should not look to this current video as the canonical example of free speech in this case. I mean, it's good as one extreme example, but for the sake of social policy, one should also consider the South Park case, and myriad of similar cases as well. In the general case, this 'toxic' issue with P2P dynamics that you speak of disappears. Yes, there will be some large, perhaps majority even, portion of the internet that considers you toxic. But if you can only have 1% of the internet that considers you non-toxic, that is enough for, IMHO people to consider their voice to have been heard. Which is I think the bottom line free speech issue here.