Vodafone: Do you take Visa? ? The Register

Originally posted by The Register

That consortium will provide a central clearing house where advertisers can rent space on operator SIMs without having to deal with the individual operators (except Three, which wasn't invited to join the board of Project Oscar),
The question that comes to mind is why isn't Three invited to the consortium? I would understand the likes of Lyca and other new players on the market, but why not Three?