Of course they have. But doing development on a device you're supposed to use as reliable communication tool as your main day-to-day device is not very nice. Double so for the stuff itsnotabigtruck and e-eyes is doing.

EDIT: I think with the above I assumed the reader would have some understanding on developing on these devices. That's unfair assumption. So I'll try clarifying here: when developing on the device you're basically messing up with the intended use of "normal" usage of the device. Trying things that might work or might not. Even with pretty "playing by the rules" development you will feel safer having a dedicated development device to test the stuff on, and another device that you use as your day-to-day phone that just works. But with the stuff itsnotabigtruck and e-eyes are doing, the dangers to making your phone unusable are much bigger than a normal applicatiion development - you really do want a dedicated testing device for that.