dansup, Mastodon does also require proxies, every app developer provides one for their own app. It can only send web push natively.

I'm contemplating push notifications for Smithereen (I'll have to have them with the API) but I don't want to require app developers to host a proxy, so I'm thinking about giving them the ability to include their FCM/APNS tokens in the app metadata. But they'll still have the option to use a proxy, of course.