I doubt Amazon would have to spin off Whole Foods... it’s not as if that grocer has a dominant position (or even is aiming for that).
Not sure about their ownership of the Washington Post - again, it doesn’t create a monopoly, does it?
This is all a bit beyond my pay grade!
But Alphabet (aka - Google) is a whole other situation. They dominate so many aspects of the marketplace - from arguably the most used mobile operating system (also found in many static devices like streaming boxes and Smart TVs). The FTC may indeed force the spin-off of some big chunks... We shall see.
Amazon also needs to spin off AWS ...