The conclusion TFA makes seems likely: these services will just err on the side of “delete first, ask questions later” to protect themselves from liability, making all sorts of legal expression impossible.
The current state of online publishing is really sad, and getting worse. Very few modern services used for hosting can be used to publish legal yet fringe or controversial opinions, which should terrify you even if you don’t agree with those things.
We’re moving toward a world where a dozen large companies will be the final arbiters of what can or cannot be published, regardless of what the law says. If you can’t see why that’s a grave threat to society, I question your imagination.
...and that’s just in peacetime. Imagine the special wartime requirements that will apply to these services if their hosting nations ever feel legitimately threatened.