"How could any business person in a sane state of mind choose to share its data with some 3rd party company" How many businesses actually own dark fiber and us

"How could any business person in a sane state of mind choose to share its data with some 3rd party company" How many businesses actually own dark fiber and use it for 100% of electronic communications? Unless you're DoD, you're most likely choosing to share your data with some 3rd party company. And if you are DoD, you're so big that you may as well be. Businesses have been carrying information through AT&T, the U.S. Mail, couriers, Western Union, etc. for decades without batting an eye. Why should Google and Facebook be different?