I don't know why this is a big deal..
There are already very popular
FREE Karaoke apps in the market for a long time in China & some of them are really popular. You can edit your track, record it, upload it & share with your friends etc. You can even invite original singers to make the track with you
I really don't understand why anyone in China pays money for Karaoke2U. What's its competitive advantage which make Chinese pay big money for it ? Sorry this is a genuine question not trying to down ramp or something.