I don't advocate intervening in World Star videos because someone could get hurt, and worse, you run the risk of ruining the lulz, but you could get $500 for doing so.
The NYPD now has a program in which they'll pay random people $500 to tackle a perp. They're tired of people standing by filming on their cell phones while they try to arrest people, probably for no good reason.
No, really. There was an article about it in the New York Post the other day.
And I quote:
“When you see an officer struggling, rather than take your cellphone out, assist the officer and you’ll receive an award of $500,” SBA president Ed Mullins told The Post.
“Far too often, we see police officers engaged in violent struggles with perpetrators while members of the public stand by and take videos of the incident. This has got to stop, and hopefully this program will incentivize good Samaritans to do the right thing.” (via)
I'd be wary of assisting NYPD in apprehending a suspect both because I'm philosophically in favor of crime, but also because if you do get involved, what's stopping them from arresting both you and the guy you tackled to the ground? They could just pocket that $500, or give it to some other guy who's in on the scam.