U.S. Senator Ron Wyden warned that foreign governments are spying on smartphone users by compelling Apple and Google to turn over push notification records

Never had issues with Element, Fair Email, Silence notifying me? I run LineageOS without Play.

I’m pretty sure Element stays active in the background, it may have asked you to turn off battery optimisation and have a silent notification always active. This decreases battery life which is why most apps don’t do this but it allows the app to constantly ping the server to check for new messages and is one way around using FCM.

Fair email uses https://en.m.wikipedia.org/wiki/IMAP_IDLE instead of FCM, I’m no expert and this is just my guess but it seems to also need the app to run in the background for this to work.

Silence is SMS and MMS only and so doesn’t use internet and so has no need for FCM or any alternative anyway

Right, yes, they do ask to disable battery optimization.

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Apps can implement their own form of push notifications – most privacy-respecting ones already do. However, it’s an endeavor that’s too much effort for the average dev, so they default to using the existing FCM service instead.

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