I've read your blog and am interested. Is the Pubkey app the only client. Can anyone write a client and Interact with people on the Pubkey app?

Relays are fungible. Exit cost is zero. In "Exit and freedom" Szabo writes: "Large proportions of the population of these countries could easily move out of the country if their local rights were violated," and this mechanism is what makes the Nostr relay model powerful. Trivially exit bad relays. How easy is it to switch home servers in pubky?

Were you aware that you can use Nostr without ever interacting with Primal or Damus in any way? You can even write your own client, if you wish, and use any list of relays among tens of public ones (or run your own). Centralized DNS is an issue. Some communities are working on that issue (Namecoin, ENS and many others). It's not an issue specific to Nostr. The only parties that can stop me from using Nostr are the same that can stop me from using pretty much anything else on the Internet: my government (they can arrest me), ICANN and a few other parties. There is no party whatsoever specific to Nostr that has any power of any sort on me as a Nostr user.

You seem to be busy asking ICANN for permission to get those IP addresses of yours, while completely not realizing ccTLDs exist... Primal and Damus are charging fees for their services just like Synonym will start charging people money to host their own homeserver or get extra premium hosting or some crap. At Nostr.land I charge a fee to host content. Like it? Pay for it. Don't like it? Self host your own, no one forces you to use a paid service