Yeah, I never understood that. At the first half sensitive job I had, the cleaning crew had access to all the computer rooms, including the server one. I had thought of trying to push my boss into using encryption for our emails but abandoned after realizing that.
I still believe it was dangerous to use gmail for the company emails when Google was one of our competitors in our niche.
And I think your belief is justified. Look at how many niche products people built on AWS and Amazon caught wind of their success and rolled out a competitor!
But I think this is not as cut and clear with an enterprise gmail account. Who really competes with Google? Amazon on the other hand competes with every retailer out there.
I still believe it was dangerous to use gmail for the company emails when Google was one of our competitors in our niche.