What could be the reason Amazon Chime did not pick?

I was at a conference AWS put on at the Javits center where they were hyped about a product called Zocallo. The audience was conspicuously indifferent.

I think AWS was hoping for a c-suite audience but the people who came were technical people who like AWS the way it is. Many of the tech track sessions were full, so I went to the more business oriented sessions, which were pretty good.

I guess in theory AWS could sell the kind of services that Salesforce does, but they haven't connected.