Those are real questions to which I don't have an answer. Although I don't believe web hosting is the problem here. Anyone can build a server and have it acces

Those are real questions to which I don't have an answer. Although I don't believe web hosting is the problem here. Anyone can build a server and have it accessed using his own IP. So censorship (by design or as a byproduct) would be hard to achieve (except DDoS obviously). Registrar are a lot more relevant because they are a service that make internet addresses intelligible to humans. So preventing one from accessing this service (either by design or as a byproduct) is an hindrance to their ability to communicate more broadly the content of their server. Same goes with search engines BTW. Also, there is another solutions worth exploring: decentralized DNS registration.