The U.K. Parliament is close to passing the Online Safety Bill, which threatens global privacy by allowing backdoors into messaging services, compromising end-to-end encryption. Despite objections, no amendments were accepted. The bill also includes content filtering and surveillance measures. There’s still a chance for lawmakers to protect privacy with an amendment preserving encryption. A recent survey shows the majority of U.K. citizens want strong privacy on messaging apps.
This is probably not going to answer your question, but the law doesn’t seem to focus on protocols/network topologies, but focuses on providers with certain sizes. So if the protocol is used by large techs, then they might have to do something on their side to comply with the law, depending on etc…