We do nip-17 via Tor. So no IP leakage. Nothing else has solved the other 3, not even Marmot, but I can use whatever does solve.

Pubky Noise looks like a good solution. I concluded about 6-months ago that Nostr is fubr'd on a protocol level. Pubky meanwhile is both decentralised and anti-fragile due to its use of PKARR and Kademlia. Probably a pipe dream but I would love for Amethyst to be the first Android Pubky client.

Pubky is a platform whose company behind it holds all the cards. I did a few tests with them but was never able to build pubky from scratch because the information is not out there.

Could you be more specific? I get that John is the architecture and design authority, but I estimate that to be a significant advantage over Nostr. It is necessarily funded by Tether (although not exclusively) because devs need to meet their living expenses.

Because its not the best protocol. It's not that I have not tried...