I don't read this as lack of commitment, I read this as "we want to keep a limit on the total number of active devices" - if it's free for two years then there will be a moderate percentage that always have it because they refresh their device every two years or less, there will be a significantly smaller percentage that use an older device and choose to pay the ongoing fee, and a much larger percentage that keep the device longer than two years but don't pay the fee. This last category is how they'll effectively manage the ongoing costs - anyone who isn't a frequent customer or willing to pay is excluded. It's a solid model.