There's a lot to take from this development besides Schadenfreude, as I see it living far from Europe.

UK founders for one need to be made aware of this since it likely impacts their business directly. But also, from an economic perspective I find it very important as it highlights that MasterCard is in such a controlling position that they can price hike like this (and possibly more) as soon as they're able to, possibly indicating a lack of competition in the space. It's an interesting example of how consumer-helping rulesets are needed since clearly MC was doing fine before this hike.