A native app you install on a phone has a strictly limited sandbox and a permission model, and if it can silently read all clipboard without user interaction, that would be a bug that needs fixing.
A native app on Android can install OS hooks for all sorts of things (such as, "you connected to a WIFI network", "you took a photo", etc) and thereby can silently react to events while it is not even running.
This is intended and requires the appropriate permissions to be given. In the same way, I don't see the problem with an extension monitoring the clipboard as long as the user has to give explicit permission for it.
Comments
A native app you install on a phone has a strictly limited sandbox and a permission model, and if it can silently read all clipboard without user interaction, that would be a bug that needs fixing.
A native app on Android can install OS hooks for all sorts of things (such as, "you connected to a WIFI network", "you took a photo", etc) and thereby can silently react to events while it is not even running.
This is intended and requires the appropriate permissions to be given. In the same way, I don't see the problem with an extension monitoring the clipboard as long as the user has to give explicit permission for it.