As soon as Yahoo and MSN started accepting gambling ads, it was only a short time for Google to join them - as their announcement this week has shown. Obviously Google did not want their competitors grabbing the lucrative advertising revenue.
Like Yahoo UK, Google requires a license to be able to advertise - but they do allow companies licensed in their respective European countries to advertise which Yahoo has yet to introduce. MSN at this stage does not require licensing.
The push to allow online gambling in the US is moving forward with former NY senator Alfonse D'Mato part of the lobby for poker sites.