As they said, there is no completely secure way of providing device ID. I think people need to get over device ID though. Often what is important it really the user identity. There is no completely secure way of providing user identity either. Something close would be combination of DNA + Mitochondrial RNA + facial + retinal scan + at least one code known only to the user. But you could have multiple users playing an iPad game at the same time, etc., and how do you handle that? This is the wrong road to go down.
You definitely have a point though in many cases we aren't interested in the user's actual identify. MyID is mostly aimed at developers who have multiple applications but need to know the actual unique number of devices they're installed on. This is particularly important to advertisers who may have many different applications.
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