What's the name of this type of connector
Not sure without knowing the exact pitch, but it looks a lot like a molex picoblade series.

With no proof to support this statement, i would say it would probably work for short runs for ethernet and usb, but it is not the ideal way of doing it as the wires are not shielded nor length matched which will degrade signal integrity at frequency at which ethernet and usb work - especially for full speed usb and gigabit ethernet.