My guess is the density of potential blackmail material _is_ what sets it apart from the others -- the very act of being registered on Grindr is almost a smoking gun for being non-heterosexual if you wanted to out somebody. Much better odds of finding a target that matches with your other info and much more "damning" evidence to scare people with.
edit: Furthermore, what other Chinese company owns a dating site used frequently by westerners?
edit: Furthermore, what other Chinese company owns a dating site used frequently by westerners?