is expo push notification service free?
if it’s freee, how can they afford it?
And is it free forever?
I’m not officially related to Expo in any means, but I’ve experience working with push notification systems.
To send a push notification, you must use Google systems for android (Firebase) or Apple APNS (for iphones). The Expo backend just abstracts that by proxing to the appropiate backend.
Push notifications don’t require very high traffic bandwidth (like for example a video stream service) nor high storage space (notifications sent are not saved by expo).
So running a push notification service has very little cost related to resources. (obviously you must code and maintain it)
And answering you last question, it will probably be free while Firebase push notifications and APNS be free too.
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