“We’re aware of reports that access to Signal has been blocked in some countries,” Signal says. If you are affected by the blocks, the company recommends turning on its censorship circumvention feature. (NetBlocks reports that this feature lets Signal “remain usable” in Russia.)
That is true for both cases as well.
One thign to add though is that signals own cencorship circumvention makes it even better at resisting this kind of blockage then an arbitrary decentralized protocol, though for an objective comparison it would take some research.