I think that's not really fair, only a few bundles a year are actually labeled "Humble Indie Bundle", and those do usually fit the bill and check all three boxes.

There were 13 Humble Indie Bundles since 2010 and 94 other types of bundles (not counting the Weekly Bundles). And those other types often include audiobooks, ebooks, comics etc. that one could claim are at least indie, or some indie games sprinkled in with the AAA titles.

There was also extremely commercial stuff such as the 2K bundles, but hey, it's always labeled as such.