Not that it is 1:1 equivalent (due to expense and difference in encoding), but blockchains such as bitcoin can be used to store arbitrary data (and have been). Thus far I believe no one has gone to jail for running a cryptocurrency node because of non-financial reasons.
>blockchains such as bitcoin can be used to store arbitrary data
You are right, 50k or so Bitcoin nodes around the world host blocks with cp which was placed there roughly a decade ago. It cannot be removed from the chain.
AFAIK nobody has been arrested for running a node.
