I'm curious what would happen if somebody uploaded illegal data (e.g. child porn, sensitive PII, or government secrets) to an Ethereum contract. Would these nodes be legally required to filter it? If you look at something like the Pirate Bay, it's not simply enough that you are an allegedly content-unaware service -- once you become aware of your service being used for or distributing something illegal, you are required to mitigate it. At the end of the day, these are businesses which operate within a jurisdiction and must act in self-preservation.

But at the point where they start filtering transactions/addresses, there's going to be big questions about what is the true view of the blockchain.