If you go to a KPOP concert, you are usually allowed to take photos or video footage - much of that is shared on YouTube and you can find about 340,000 results on YouTube for "KPOP Concert
" - and the results actually show KPOP Concerts.
If you do a search for "JPOP Concert
" on YouTube however, you get 35,000 results and hardly any concert footage.
The reason is that management of Japanese artists/record labels dont allow fans to take photos or videos and even if somebody did, the record labels usually use music matching to automatically pull any footage that contains music that they own from YouTube.