> Wouldn't it be better to try to regulate the necessity of needing these services out of existence?

No because these things are genuinely useful. As much as people lament that we are going cashless, it's very convenient to be able to just carry one card and it's genuinely useful to just give my email as an identifier when registering for stuff.

Regulating their necessity means forcing people to accept cash and then using this as a reason why MasterCard and Visa should be allowed exist. In practice if something is that ingrained into daily interaction, then it should have something like the common carrier rules, set the fee to a static percentage of the transaction and that's it. The current 50% profit margins rent-seeking approach is just inefficient.