When I worked at PayPal back in 2003/4, one of the things we did (and I think we were the first) was encrypt the datacenter backhaul connections. This was on top of encrypting all the traffic between machines. It added a lot of expense and overhead, but security was important enough to justify it.

And yet Venmo, a Paypal company, publishes transaction data publicly by default, no need to decrypt anything ¯\_(ツ)_/¯