Samsung Galaxy Note 9 running on Android 9 stores all old clipboard entries which requires me to manually delete it every time.
How can I opt-out of this "feature"?
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After a long while and more serious privacy flops I had, I found a solution to this security breach of Samsung (Credit).
Not tested because I am not rooted
ClipboardSaveService and ClipboardUI are made to keep copies of the Clipboard, and your system copy functionality will break if you disable/uninstall them (You need a ported AOSP version to let it only copy once and to make it be stored in the RAM not stored in the NAND)
You can use an Automation software (like Automate or Tasker) to delete "/data/Clipboard" files after you paste. (Yes this is the directory that Samsung store the files in it instead of RAM)