OK, used to be you had to somehow physically get into an enterprise in order to install a hidden modem and then hack the system.
Now you just build a little computer, probably costing less than $100, with connection capabilities to both cellular data and wifi, and ship it to your target.
(From the wording in the article, I think this is just a research project ... for now ...)
Wow - now go for the worst case scenario - a one way trip with consequences.
Imagine Bank Robbers getting coated in Purple Dye or worst.
If this takes off, shooters are out of business.
Regards
Caute_cautim