this happens on a samsung galaxy android device. i have a foss keyboard set up and never use the samsung keyboard app.
whenever i copy text, the toast message flashes that samsung keyboard has pasted from my clipboard.
i cant find any option to control clipboard access. how does one turn this off altogether?
Adb is availible for Mac and Linux too, so maybe start using your brain (assuming the rare case in which you have one)
https://www.xda-developers.com/install-adb-windows-macos-linux/