If Microsoft wasn't doing ever worse privacy things with Windows I'd seriously look into switching away from Mac OS given the ever growing issues it's been having with every release.
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You can't remove or change this behavior because some people love it.
EDIT: FWIW the above statements are oversimplifying the situation of course: https://en.wikipedia.org/wiki/X_Window_selection
And more here: https://unix.stackexchange.com/questions/13585/how-can-i-use...
Most fans of Linux will claim the fact that you can choose any number of clipboard managers to customize things to your liking is a critical aspect that draws them to the platform.
Others among us (whether reformed or uninitiated) will commonly cite this same stuff as the reasons we avoid Linux on the desktop.