I am sorry, it is not regulated by CFTC as far as I know. Your account is not safe. But I have seen their ads on YouTube feeds.
Their website https://us.plus500.com/ says they are registered with CFTC and NFA.
The trading of futures is available through Plus500US Financial Services LLC d/b/a Plus500, a Futures Commission Merchant registered with the US Commodity Futures Trading Commission and a member of the National Futures Association (NFA ID number 0001398).