That's like asking HN if they buy Christmas CDs at Tesco. This is a very self-selecting group of people. I know people who buy off of iTunes, who don't use Spotify, who've never heard of Bandcamp, who still listen to the radio… there are people beyond your little bubble. It's a big old world.
You're re-arguing their point. They are saying it's such a diverse market that iTunes doesn't effectively act as a proxy for the whole market anymore, not that no one shops there anymore (shades of "No one goes there anymore... It's too crowded!").
I've had pretty good luck finding bands on 7Digital when they don't have a Bandcamp. I'm sure they aren't perfect, but they seem better than Apple at least.
That's like asking HN if they buy Christmas CDs at Tesco. This is a very self-selecting group of people. I know people who buy off of iTunes, who don't use Spotify, who've never heard of Bandcamp, who still listen to the radio… there are people beyond your little bubble. It's a big old world.