If you want that cricinfo to display the ads of your favourite casino, better ask that casino to advertise there.
Even there are ads on Cricinfo which are not relevant to any casino, not relevant to cricket and even not relevant to any company sponsoring any event.
I just saw the below ad at Cricinfo, about a drink in our local country named "Rooh Afza". Since there will be the holy month of Ramadan in the next few days, and therefore they are advertising this drink on Cricinfo. So this is not relevant to cricket or any contest so I do not understand what benefits will this drink company gets by advertising at such sites