以前から

WARNING: This app is no longer in support. I haven't been a Nostr or Safari user for some time and no longer have the will to maintain this application. When the Apple developer license expires, this app will drop off the App Store. If anyone wishes to fork this app and restart it, you have my blessing. Sorry for any inconvenience.

https://github.com/ursuscamp/nostore

というアナウンスは掲載されていたので、その日が遂に来てしまった形。