As I was saying in my last post, there is no such thing as free, there is always a catch. Most times, free services recoup their profit by selling their patron's personal info to other companies. They know that on the whole, and in this economy, they won't make much money if they were to say "here is my service, if you like it, you are going to have to pay for it" so, instead, what they do is say, "here is my service, unlike, X, Y, Z, our service is completely free because we care more about people than we do about making money, however, we only ask that you allow us to show ads so that we can maintain server costs."
While it might seem like such a small request for providing such a great service, and most will agree to put up with ads for that reason, they don't realize that those ads are collecting as much info about that person and their device as they can so they can sell it to anyone who's willing to pay for it. These companies know that, in the end, they will make more money on that individual's personal info being sold, so it really is no big deal for them to offer their service for free. Especially when doing so, will get more people to their service than their paid competitors, and lead to a bigger profit in the end.
There will always be other alternatives. Pandora is great, but it is not the best and truth be told, it needs work. Most of the time when I search for an artist from a certain music genre, I get something else completely different.
If I search for freestyle artists such as Expose, George Lamond, TKA, etc., there is no way I should be getting Ian Vandahl, Deepsky and Louie Devito. They are not of the same genre.. the former is Freestyle and the latter is Techno/Trance. Hell, they didn't even originate from the same side of the planet. I might get a few songs from other freestyle artists, like I am supposed to, but eventually, I'll end up with something completely different before too long.
That is not the case with other music services like IHeartRadio, TuneIn and Raditaz, which not only is more accurate, but they also have a larger music library than Pandora.. and is free.. and even if I were to go for a paid version of these apps, then I would sooner do so for one of these 3 than I would Pandora for these reasons alone.