Maybe VISA does not want anything to do with bitcoin. Then again Mastercard openly said they hate bitcoin and doomed it to fail... Which is very strange.
lol... Right now, as Visa is enjoying their no.1 position, they don't want to tarnish their reputation by associating with risky businesses such as Bitcoin. Mastercard, on the other hand is trying to seize market share from Visa, and is more open to risky business. Although the Master bosses might hate Bitcoin, they will
temporarily set that aside to get new business.