With the MemoryGuardian (FOSS) app, you can set up to automatically clean the clipboard at any time you choose and you don't have to use the adb and expose the device to vulnerabilities
AFAIK they removed the permission (was it a permission? Idk) to manage clipboard or it's not like it's used to be. I'm sure apps can't control your clipboard itself but only the last copied text/element.
I recommend you use some keyboard that is open source and that doesn't have an internet connection urgently. Samsung's default keyboard has internet connection, full of spyware and collects metadata of everything you type on it. Simple Keyboard I think is a good option