To be considered a sell out, you have to flop in your first genre then switch to mainstream to become successful.
Maroon 5 was already successful. They just decided to change their sound.
A perfect example of selling out is Katy Perry. All the artists you guys mentioned aren't really sell outs.
Liz Phair. For her fourth album, she worked with The Matrix in order to score some some hits. A lot of her supporters from her indie days didn't like her new sound, so they ditched her.
