Is there any proprietary Android app for which you wish there would be an open-source alternative?
Basically, what the title says. Do you use any app, that is proprietary, but either has no OSS alternatives or they're all not good enough? If there is an alternative, what keeps you from switching?
There already was a post like this this year but now my answer is "a standardized push notification system (most likely federated) that's actually possible to be implemented in a user friendly way". Google doesn't want to encrypt theirs afaik and apparently some people are concerned about the traditional "every app is responsible for its own notifications" approach consuming much more battery, even though I didn't notice it myself (I guess it's possible if you have 50+ apps installed but it's not something that should be a thing in the first place).
Idk about Element but Signal uses the Google's insecure implementation if the device has gapps installed and it uses the traditional system which is not push if gapps are not installed.
Molly FOSS and Molly with UP replace the Google's notification system with websocket and UnifiedPush respectively for its own notifications. Google (hopefully) doesn't have access to all notifications you get on your phone but only to those sent to apps that utilize their push implementation which Molly doesn't use.
Afaik Signal servers have nothing to do with it. There are 3 possible situations depending on what app you choose.
Official Signal app. It asks Google to check Signal servers for notifications and to send them to you if there are any.
Molly FOSS. It connects directly to Signal servers without any push middleman.
Molly UP. It asks the push notifications provider you choose (but not Google) to check Signal servers for notifications and to send them to you if there are any.
Ultimately, it's the apps and not the servers who decide if they want to use Google's services or not.