Think of it this way, NOSTR is a protocol, anyone can create a website around it.
Clients will come and go. As will relays.
Anyone can host a relay, or subscribe to any relay they have permissions for.
So for example if E. Macron wants to create a “French” public nostr client website that scrubs all the riot posts or anything bad about the French government, and highlight in bright yellow any post supporting Klaus Schwab and the WEF. He can.
Nostr allows that.