A sprawling informal economy of rogue streaming devices has taken hold across the U.S., as consumers fed up with rising TV subscription costs turn to cheap Android-based boxes that promise free access to thousands of live channels, sports events, and on-demand movies for a one-time $200 to $400 purchase.

The two dominant players -- SuperBox and vSeeBox -- are manufactured by opaque Chinese companies and distributed through hundreds of American resellers at farmers markets, church festivals and Facebook groups, according to a report by The Verge. The hardware is generic and legal, but both devices guide users toward pirate streaming apps not available on any official app store.

vSeeBox di...