I don't buy into the whole underground/ commercial thing. being 'commercial' does not make an artist bad, nor does being 'underground' make an artist good.
It could possibly be argued that, generally speaking, underground artists should have more integrity as their music does not have appeal to the lowest common denominator - there are no marketing constaints imposed on them,,, but this doesn't necessarily mean that their music will be 'better'.
Few 'underground' artists actually take advantage of their freedom to experiment, break the rules, or express their uniqueness,,, preferring to hide behind their own formulaic style.
In fact, the 'commercial' 'constraints' imposed by record labels often make for better music (their insistence on world-cla** composition, world-cla** musicians, world-cla** production etc).
the integrity of skwatta kamp's music has suffered, not because they sold 80,000 records, but because they are making formulaic music. They could still could write a hot track one day though.