Didn't see anything discussed about this here, so I figured I'd ask.
Apparently it's targeted and not everyone is eligible.

https://www.discover.com/credit-cards/send-money/

"Discover has partnered with PayPal to bring you a service that lets you send money to just about anyone using your computer or mobile phone...
There are no fees to send money and the amount will be charged to your Discover card account like a purchase. If you are sending money to friends or family, there are no fees charged to them to accept the money. If you are sending money to a business for goods or services, PayPal will charge them a fee to accept the money."