Somewhat related, I was quite surprised when I discovered that my Samsung phone was sharing ALL my clipboard with all my other Samsung devices, including passwords copied into the clipboard, and even preserving the history. I can't remember if the sharing was enabled by default or I opted in by accident. I assume it also goes through their servers to reach my other devices. I could disable the sharing, but still can't turn off the clipboard history, even switching to a different keyboard, the Samsung keyboard still captures the clipboard and saves the history, when I switch the keyboard to Samsung everything is there... I guess my next phone won't be Samsung.