Do one-click API Betfair Software restrictions breach competition law?

It is my understanding that Betfair explicitly ban/prevent/refuse to licecne API vendors from developing one-click betting software which allows customers to place a bet with a single click which is submitted to both the Betfair exchange and another exchange - for example the Duq. Presmably this is because they are frightened of liquidity leaking away. This strikes me as likely to be anti-competitive, even possibly against competitition law. However, I am not sure as such a case could be brought against a gambling company. HowevMy reaction is only a gut feeling as I am not a qualified lawyer. Is anybody suitably well-informed and experienced in this area to offer an opinion on this?