Okay, but your agreement with Spotify on the free tier is "we provide music, you agree to be subject to our ads." If you block the ads, they can then yank the music.
Personally, I haven't jumped on the streaming music thing (iTunes Match is about as close as it gets for me with buying CDs or MP3s to add to it in time), but I don't think what they're doing is a bad thing.
Now, if you have some means to force the various ad networks to prevent hijacking a device and then telling me congratulations for being an Amazon customer and some random item blinks on my screen, I'm all ears. But ads in and of themselves, I don't have a problem with.
Personally, I haven't jumped on the streaming music thing (iTunes Match is about as close as it gets for me with buying CDs or MP3s to add to it in time), but I don't think what they're doing is a bad thing.
Now, if you have some means to force the various ad networks to prevent hijacking a device and then telling me congratulations for being an Amazon customer and some random item blinks on my screen, I'm all ears. But ads in and of themselves, I don't have a problem with.