Facebook: Instagram, WhatsApp, Oculus
Google: DoubleClick, YouTube, Android, Waze, Deep mind
Amazon: Whole Foods, Audible, Zappos, Ring, One Medical
Arguably, I think things would be better if a bunch of these acquisitions were never allowed in the first place. But most of Apple's acquisitions have been of the "acquihire" type where they got specific technologies to enhance their products - Beats is the only one I can think of off the top of my head that has basically remained separate.
I'm not saying acquisitions are the only benchmark for breaking up big tech, but to me it feels like the places where Apple is anti-competitive (e.g. App Store) can be remedied with much smaller changes than a full break up. With the other 3 it seems easier to identify places to "cleave".