I am not surprise that MasterCard attack bitcoin as bitcoin maybe is the killer of mastercard.
Bitcoin is another thing.
Sure bitcoin is not perfect and there is still a lot of work should be done.
But bitcoin has the potential to replace the falt .
Yes each and every company will attack its competitor when they see it as threat for their businesses and for their potential customers and mastercard did the same as they know that bitcoin is the future currency and can easily replace the fiat once the adoption level goes higher and higher.