+++ath0@ RE "Not sure why you say Amazon can have a very relaxed attitude to this, "
Well, I did include in brackets "if they are sensible". Furthermore I made the point that only a small percentage of their customers are going to do this and so (as others have pointed out) it would be a waste of effort and money locking it down. I also made it pretty clear that IMO it will be rooted *however* hard they try to prevent it - the temptation will be way too much, with the result that Amazon will achieve nothing. The people who have the knowledge/inclination to do this will do it, end of.