I haven't watched the homepage you named. But they are not the first ones who try to copy BJ. Poison for example did it, too. If you look for example at their video of every rose has its thorn you see that it is nearly a 1 : 1 copy of the Wanted-video.

A successful band, no matter which one, will always have other band copying them hoping for the same success. It starts with old rockbands over boybands until today's casted bands. One of them is successfull so 10s of others will follow.