They could be intending to sell the unlock.It seems to be a combination of already available tools but if they were able to set the max unsigned apps to 10 why not just unlimited? Another interesting thing is that .xap files are downloaded from it's marketplace to your PC and then deployed to device. I did see some code in a .dll using Notepad; get .xap, fix .xap, sign and deploy. If you wanna poke around without installing just unzip the exe. to a folder and all the .dll's and such are there in English.
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