They need to be under the eyes of the public all the time because like what happens to Amazon, Visa needs customers like us to survive. People need to feel secure when they use their VISA/MC/AMEX what-else credit card payment gateway. While they rip-off merchants and businesses with their astronomical fees, they need us to keep using their cards and their network.
Hence, all this advertising.
Same goes for places like coca cola, McDonalds, apple and all that, they are super rich and wealthy and everybody knows about them anyway, so if they did no marketing at all they would still be known. However with more marketing comes more money most of the time and that is why I believe that we should not judge them for making a commercial. The weird part here is not that they are one of the few places that does what they do and they are already super highly known so they do not need it, that is something I can understand and I support the decision to make an ad.
However, the weird thing here is that they act as if they are helpers of the world trying to connect people together and help the people who otherwise couldn't, bitcoin really does that, crypto does that but Visa charges a lot of money for that so not like they are a charity, they are a business that makes billions.