There's already been lawsuits against Freenet and IPFS itself, the nodes being downloaded from aren't exactly easy to track either. So far the authorities have went directly after the main source, which is Freenet Project and IPFS.io rather than the actual nodes. The authorities have been unsuccessful because both Freenet and IPFS have legitimate legal uses, far more than anything illegal, and the argument is that any legal tool can be used for illegalities. Car salesmen don't sell a car with the expectation that a ton of pedestrians will be slaughtered with it.

Trust me, they've tried, and they've failed. Authorities have tried going after a Freenet node before, the case was quickly dismissed due to the nature of the storage being put forth in good faith of being used for legit purposes and encryption preventing knowledge of what's there.