iOS already prompts for other things like "app Foo would like to know your location: Never, Only when open, Always". Users are use to this. I'd love a popup like:
"TikTok wants to see what you've copied into your clipboard: Never, Once, Always, Uninstall that spyware".
Then I could make informed decisions, like sure, my package tracker can see if there's a FedEx URL in my clipboard. I'm OK with that. There's literally no reason why I'd ever want Instagram to check my clipboard, though. May you do, and you could give it permission.