When the API for pushing public keys to lists will be open, it could be used by nostr clients to deliver push notifications to their users.

Nostify.me => POST server.damus.io/webhook => Push notification "X just liked your post"

cc nostr:npub18m76awca3y37hkvuneavuw6pjj4525fw90necxmadrvjg0sdy6qsngq955 nostr:npub1plstrz6dhu8q4fq0e4rjpxe2fxe5x87y2w6xpm70gh9qh5tt66kqkgkx8j nostr:npub13myx4j0pp9uenpjjq68wdvqzywuwxfj64welu28mdvaku222mjtqzqv3qk nostr:npub12vkcxr0luzwp8e673v29eqjhrr7p9vqq8asav85swaepclllj09sylpugg nostr:npub1sn0rtcjcf543gj4wsg7fa59s700d5ztys5ctj0g69g2x6802npjqhjjtws