Reporting what? That you were scammed by a bounty manager who promised to pay you certain amount of his worthless ICO tokens and disappeared without doing so?

This is how I imagine your conversation with the police will look.
Is this the police? I want to report a scam! Some anonymous person on a forum told me that I'd get $50 worth of his tokens if I translated his white paper and... What is a white paper? It's a text meant to describe an altcoin project that... What's an altcoin? You won't write the report because I wasn't promised real money and I don't have his name and address? But he's a scammer!
If you are the manager and it's a bounty hunter that tries to scam you the conversation will be even better, since breaking forum rules is not a criminal offence.
What are you going to complain on to the authorities? Getting banned?