The power is USB of some sort, isn't it? Are they not built to take data from that port? Oh...it wouldn't be getting power then...shit.
From what I've read online it's only there for power.
Not to mention powering devices using USB is cheaper than the old style AC adapters used in the original NES.
Again it's $60 for 30 classic games. Comes out as $2/game with authentic controllers and HDMI output.
My sole complaint is that the the NES Classic mini is the EU version and it does not include a USB plug or a 2nd controller.
US version has the USB plug
JP version has 2 controllers.