It felt like:
Amazon - Shipping, quantity over quality. PMs wanted to just ship the new announcement at Reinvent.
Microsoft - Revenue. They wanted to make money. Everyone does but Microsoft really highlighted it.
Google - Technology. We wasted so much time circling about architectural stuff in partnership meetings. So confusing.
This is all very reductive and my own opinion, but it's how I'd characterize it.
What was each of their core value system? As in, what did they care about as an org and what did they not care about?