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Not protocols, but usage. Not emotion, but common sense.

If Skype, a peer to peer network that uses a proprietary protocol and third party servers (neither of which is a prerequisite for a peer to peer network), was used primarily for file sharing over encrypted links, they would have some "big problems", as in "heavily funded lobbyists and plaintiffs", to deal with. These are the same "big problems" that are the driving force behind SOPA and consequently the same ones that have injected some steam into this reddit "think tank". SOPA has some interesting language where it refers to "or any successor protocol". Perhaps the next revision, or the next bill of this nature, will include language that refers to "any internetwork", present or future.

How a peer to peer network is used and who uses it does make a difference in terms of its acceptance and survival, even if in theory it shouldn't.