It's 2018 and there's no simple way to send a file to someone without also sharing it with several of cloud provider companies in between (cascading to their own infrastucture vendors, like AWS), any of whom could be next on the news with a data breach.
In many cases we have an NDA with one party, and then send sensitive data through several parties on the cloud with whom you have damage waivers signed when clicking past their terms of service.