I don't see why some people think this is 'targetting' the IoM
Looking at teir T&Cs: The competition is only open to all residents in the United Kingdom, Ireland, Isle Of Man Or Channel Islands aged 18 years or over
And it probably gets around the lottery rules by making it a 'skill-based competition':
2.2. All competitions are skill-based competitions. Entry fees for online entries are payable each time you enter. Where the Promoter offers an easy or multiple choice question, a free entry route is available.
2.3. To be in with a chance of winning, everyone who enters the competition (an “Entrant”) will be required to correctly answer a question or solve a problem set by the Promoter (the “Competition Question”).