That doesn’t really make sense. What incentive could a $6.99 dongle possibly have in allowing random hackers to access your stuff? The dongle maker certainly can’t access your stuff, not with a $6.99 connector.
Are they hoping the hackers will see that a person used this, and give them a percent of the profits?
No. It’s not rocket science to make a charging-only usb cable. That’s why it costs $6.99. There’s no secret to it either. These guys aren’t doing anything the $6.99 version doesn’t do. They’re just marketing it better, and jumping on the crowd-funding bandwagon.