Apart from that, they build phones, run datacenters, develop self driving cars, business software ...
As for Azure, I think Googles cloud business is in the same order of magnitude. I don't see one of them having a long term competitive advantage here.
As for Apple, I think consumer demand in tech will grow just like business demand in tech will grow. And I don't see anyone disrupting Apple either. They will just continue to iterate and grow.
IF some new development appears on the horizon, then it will be interesting how the 3 CEOs will position themselfes. But at the moment, I don't see anything that will disrupt any of these companies.