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> Because you "own" the book you buy directly. You don't own titles through Kindle Unlimited, you are borrowing them.

Could someone please explain to me the concept of "borrowing" for digital books which can be infinitely copied?

You're not borrowing a digital book. You're borrowing a permission slip to read it.

+1. It's not about the bytes of the book, which as noted are infinitely and trivially copyable. It's about licenses and ensuring money flows.