Visa/Mastercard consider crypto an existential threat - the value add that they have in terms of consumer protection, middleman conflict resolution, and fraud prevention does not add up to that 2-4% level of value, and they admit that. Trust and the network effect keep them in play for now.

https://qz.com/1646097/what-does-facebooks-crypto-coin-libra...

Crypto transactions however, have not lived up to the "hype" of being truly cheap thus far. Visa/MC are positioning themselves such that the value they bring is not something that crypto can provide. We'll see where that ends up - I'd expect Visa/MC stock to move a bit if the transaction fees for Libra end up being sub-$.05.