They probably had to do it that way for some sort of accounting reason. Now that all the majority of devices are newer they can move it to free as they're accounting for their sales with hardware. It's a guess but usually in business and retail how things are accounted for cause some wacko issues.They made them free to any new owner since 2013... surely everyone has met that criteria by now right? Who will this appeal to?
Genuinely curious, not bashing!
Source: I am a retail manager and have to explain stupid reasons to customers daily.