Comment by pjmlp

As anecdote, none of our customers use anything that risks putting their internal data into someone else data center.

They value their business and possible legal consequences, in case there is a data breach coming out of Gmail or similar online services.

Of course companies that don't care about NDAs compliance, medical data, critical research information, offshoring of customer data, the upcoming GPDR 2018 and similar laws, can put their internal data wherever they feel like.