They are not cloned---they are copies [almost undetectable] made by different manufacturers in China.
There is no protected patents as in UK/USA so lots of little companies spring up and copy products---they use same components etc and same firmware ie Yojiatech and Skybox. So the only way of realising a copy is to scan the code, but even that gets copied so unless you buy direct as I do then you may never know you have a copy, a genuine or an actual clone mascarading as the real deal.
Reaper.