It’s not something new for Visa to work with any cryptocurrency company , it’s an old thing, Visa and MasterCard has been working with lots of cryptocurrency companies, they are working with BitPay for cryptocurrency debit cards, and they are working many others as well.
As for this collaboration with BlockFI, I don’t see much there, but it’s still a really cool thing that they have done there as rewarding people for making purchase using cryptocurrency will make a lot of people to want to make use of cryptocurrency so that they will be able to get some cash rewards or whatever other rewards that is being given.