This is a sign that the crypto world is increasingly popular around the world and many large companies want to work with it, as you said Mastercard is a large company that stores many assets so that every transaction that is done there are no obstacles so that we are comfortable in using, if later their cooperation can run well then crypto cards are easy for us to use, And this will also have a positive impact on the crypto market itself, although this is only a business from Mastercard but cooperation like this expect.
A bank or payment provider that ignores an asset class that is worth more than two trillion dollars by now must be insane. This is similar to Steve Ballmer claiming that the Iphone will fail with the difference being that cryptocurrencies have already a proven track record.
Mastercard, if you ask me, took even quite long to really get on board.