I can already hear professor Tanenbaum's evil laughter, followed by "I told you so" :) Although for the life of me, I cannot figure out why Google suffers so h

I can already hear professor Tanenbaum's evil laughter, followed by "I told you so" :) Although for the life of me, I cannot figure out why Google suffers so hard from NIH syndrome and didn't go with something like seL4/Genode. Do they just want control of absolutely everything they touch?