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A comment on Android phones are sending significant amount of user data with no opt-out [pdf]. Parent comment

Re:Android phones are sending significant amount of user dat... by marcellus23 on Tuesday October 12, 2021 @11:44AM (#28841144)
This is correct. iOS snapshots the app as soon as it's moved into the background, and that snapshot is what you see. When you bring up the switcher, the foreground app isn't backgrounded yet — that only happens if you go to the home screen or actually switch apps.
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Re:Android phones are sending significant amount of user dat... by interpol_p on Wednesday October 13, 2021 @02:30AM (#28848864)
If the app is using the Background App Refresh entitlements [1] (Background fetch / background processing) then it is possible for iOS to update the screenshot for the app switcher periodically even when the app is in the background

Messages does this, as you will notice that an active conversation tends to be up-to-date in the app switcher

[1] https://developer.apple.com/documentation/uikit/app_and_envi...

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