Can see why, but they should be up front about it
To be fair, the reasons they gave are acceptable from a technical standpoint - it really would make song recognition less good at its job when people want to identify a song - I know what the scramble is like when the song's about to finish :)
However, they should be clear about the behaviour as some people won't want that - the power draw on mobile devices is the first issue that comes to mind, followed closely by privacy concerns by would-be attackers using it as a potential attack vector.
Biting the hand that feeds IT
