When video hosting sites like YouTube and Google Video emerged on the scene, their growth came at the expense of decentralized P2P networks. Some online freedom activists are discouraging their use, claiming that it centralizes too much power over Internet's content, making it controllable by large corporate interests that have historically given in to government's demands.
Due to the torrent effect, if as many people used P2P networks instead of YouTube, the speed and convenience of video access through them could become almost as good, and without the ads. It would also make it impossible for any centralized authority to control which information is proliferated.
Here's one example for YouTube censorship
[just mentioned on SlashDot.org] --
[YouTube, a] Google property, has recently banned the popular atheist commentator Nick Gisburne. Gisburne had been posting videos with logical arguments against Christian beliefs; but when he turned his attention to Islam (mirror of Gisburne's video by another user), YouTube pulled the plug, saying: 'After being flagged by members of the YouTube community, and reviewed by YouTube staff, the video below has been removed due to its inappropriate nature. Due to your repeated attempts to upload inappropriate videos, your account now been permanently disabled, and your videos have been taken down.'
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These kinds of examples of videos being removed for political reasons have been very rare so far, but this is characteristic of the "long leash" mode of media censorship that is common in the United States: don't make any martyrs unless you absolutely have to, trivialize and water things down instead, but always retain the power to pull the plug.
Maybe this is an effect of natural selection, with the more freedom oriented users preferring to share content the decentralized way, or maybe it is subtle foul play, but it has been my observation that the unpopular opinions that are most easily dismissable (ex. Loose Change) attain disproportionate success on sites like Google Video, and steal the spotlight from more substantive ones.
Like the disrephrency between mainstream media and shortwave radio, online multimedia content distribution has effectively been cut in two pieces, with the more mainstream topics proliferating on YouTube-type sites and more controversial "free speech" topics proliferating on small BitTorrent trackers, access to which some ISP's already choke due to allegations that P2P is only good for piracy...