Thinking about it more - it's the Steem blockchain that's actually storing the content, so I would think that to operate in the EU it would need to abide by the "right to be forgotten" regulations, which it obviously can't since it's immutable. So this could potentially be a legal framework for the EU and other governments with similar laws to ban Steem-based services in their jurisdictions.

That could be a big potential problem for the future of the platform. In theory I think the same argument could be applied to Bitcoin or any blockchain really...