One simple solution is just to gate the programmatic access by confirming with the user when the app wants to read the clipboard.

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hbn a day ago | parent [-]

iOS does this

You get an "Allow paste from <app>?" pop-up. Possibly only the first time you past from one app to another? Or maybe it resets after a while. I don't know the details.

	▲	Rohansi a day ago \| parent \| next [-]
		You need give permission to websites too. It's weird they haven't transitioned over to requiring permission on Android yet.
	▲	forgotusername6 a day ago \| parent \| prev [-]
		The last few times in opened the eBay app on android my phone helpfully told me that the app had pasted from my clipboard... No idea what eBay was doing with that but it's a bit late if I had anything sensitive on there