What I meant was that there is no sense in sharing the code for a special purpose kiosk app.

For people who are interested search for 

gpl infringement tv boxes

You will find many examples of companies who took gpl too lightly and got sued by FSF. The more users a product has which used GPL without making the code available the higher the risk gets that they get sued. FSF isn't as weak as many think they are. 
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