It's not just the STEEM Blockchain that presents privacy issues. As I understand it (not too much) all blockchains store their data forever, this can present issues of copyright infringement legal actions against the holder/uploader of infringing material maybe not now, but maybe a year, or ten years later..
dTube for example could potentially have legal issues in future if users upload copyright materials without licence or if nodes store any IPFS files that infringe copyrights.
then there's the issue of copyright being different in most countries, US copyright seems the most widespread (they expect it to be universal) Some things are out of copyright in certain countries but still under copyright in the US...so the content makes it to a blockchain which is decentralized...so the dilema begins.
It's an exciting transforming world we live in and laws will have to evolve.