It's not like they're credited. Could be. It just says Hatsune Miku - The World Is Mine. Maybe on an actual album they get some small 5pt font on the back side of the front cover that nobody reads.
If you look up some of the songs, you'd see that the artists are named. Granted they don't usually go by their actual names (I highly doubt there's someone actually named 150P, for example), but they're still named.
As a software developer myself, the software itself is something you're proud of, not what other people do with it.
If I had developed the Vocaloid software, I'd be pretty happy to see people making music with it.
Someone presented this to the class and I was just blown away at how stupid people can be. In America, artists are criticized and disliked because of their use of just autotune on their voice. In Japan, people spend millions of dollars developing loving 3D HOLOGRAM TECHNOLOGY and hosting psuedo-raves to worship their idol which is a computer generated voice and animated character to go along with it.
So you're expecting all countries to be the same as America, music-wise? Also, what about people who go to a concert for their favorite band? Are they worshiping that band just because they went to the concert?
In my opinion, Vocaloid is a pretty impressive software. People have done a lot of impressive stuff with it. And besides, not ALL the Vocaloids are Japanese. There's SeeU, who's Korean, Oliver, SONiKA, Big Al, etc, and those are all English. Just because someone's a fan of the character, in this case Hatsune Miku, doesn't mean that they
worship it.
Granted, there are some people who do worship it, but what about the people who worship gods? I don't see you getting on to them for worshiping that.
For some reason part of the curriculum is learning about these weird forgets.
I don't see anything wrong with learning about another country's customs/culture.