You are in an existing poker cash game or have an active Casino session. You are under 19. You must be at least 19 years old to play on PokerStars in Ontario. You can't legally gamble if you're under this age and will need to withdraw your funds from your account balance.
On April 15, 2011, the U.S. Attorney's Office for the Southern District of New York seized and shut down Pokerstars and several of its competitors' sites, alleging that the sites were violating federal bank fraud and money laundering laws.