They can't prevent it, but they can certainly disavow it. By explicitly saying they don't support it or by making it harder to sell to the next person like region-locked or console-locked media.
I guess I'm surprised they don't! As the other commenter points out they have a page dedicated to this. I conflated their stance on secondary sales with their hardware and software self-service hostility.
How would or could they? Apple devices have the biggest second-hand market.