Nostr has options in a few apps where you can pick your translation server, paid vs free. Might be worth exploring? Takes the API load off of you. This SS is from Damus.
I really suck at knowing what stats are relevant here, but £200 predicted costs divided by somewhere between 6k to 10k monthly active users goes to a very small number
The infrastructure needed for notifications isn’t free
You tend to go from a serverless setup to computing instances quickly and beyond your free dev account super fast
Afaik no: they push the notifications to the APN/FCM servers that in turn push the notification to the devices.
I’ve submitted a PR against Graysky to implement notifications (and it works using expo’s notification service), so I’m interested by this discussion.