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It's like burning 100 copies of Avatar and then giving them away for free.
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It really isn't.
I'd say Garry's Mod ragdolls probably comes under the same umbrella as fanart: technically breaching copyright, but most companies will ignore it as it doesn't harm them. Not to mention actually suing someone for it would bring them more bad publicity than it's worth.
Bottom line: if you're not making money from it or claiming it as your own creation, developers probably won't care.