This is a tenuous argument at best, even more so considering the protocol in question is freenet. Sure it's possible to force a commercial model onto any system, but I'd think freenet would be an especially terrible way to monetize. (And "industry" - seriously??)

Furthermore, there is presumably enough existing child pornography out there to satiate any viewer for their entire life. Perhaps increasing access to it is the way to discourage more being made! At any rate, paying for it could still be a crime, as opposed to the insanity of strict liability for bitstring possession.