Well “there was a time” when it was more true. Now so not really. With the exodus the bar at Amazon/AWS for taken has fallen quite a bit and in many areas a leading L7+ at Amazon is maybe a B-lister at best elsewhere. Especially in competitive areas like AI and ML where Amazon can no longer attract and retain the best in the market.
See recent press on leaked internal doc about folks at AWS whining that they struggle to secure speaking spots for their folks at AI conferences because nobody sees AWS as having recognized leaders in this space.