These are actually fun! Way better than the first batch of the underground ads. I especially like the second one, because it makes it pretty clear what Curve actually is. The first one confuses me a bit. In Poland, at least, virtually all cards are contactless, so “making your cards contactless” is no perk. I don’t know about the UK, though, maybe it is something worth advertising.
At first I was quite surprised with that, because it might suggest that the service is provided by Mastercard and they might not enjoy it, but I personally think I like it that way. First of all, the Mastercard logo is just great, it’s both aesthetically pleasing (for me) and widely recognizable. Second of all, being open about being supported by a large corporation like MC is a good PR move for Curve.