From reading the article I don't believe they should charge the streamer with anything. It wasn't his fault of the people got out of hand.
Thousands overwhelm New York's Union Square for streamer giveaway, tossing chairs and pounding cars
A crowd of thousands of people who gathered in New York City's Union Square for a popular livestreamer's hyped giveaway got out of hand, leading to injuries and arrests.
apnews.com