P4T0U
Member
Because they're basically covers/remixes for ZUN's songs, and only occasionally use certain well-known riffs as "homage". And considering most of these albums never see the light of the day outside doujin circles in Japan, I don't think anyone really gives a shit. And who knows, maybe they did get the rights to publish a cover.
The one P4TOU posted is more like SNBN with one riff from ZUN though, go figure.
It's a zero!...not an O. (/ˈoʊ/)
You really have to search for "children bodom" on youtube and sort the results by upload date to randomly find it.