“Do you really believe that bitcoiners are using custodial nostr apps only because the interactive push payments?”

Yes, absolutely. When we started out over here, lots of people were using non-custodial but trying to explain to people how to receive payments was frustrating, and you couldn’t just post an address and have it work. Even most of the people who were using non-custodial ended up switching over to get a Lightning address, myself included. 

I watched it migrate in real time. The inability to post an “address” and receive a zap was THE reason the overwhelming majority went custodial.