"Micropayments" have always been something different. We technologists just figured there would be a way we could whip up some accounting software, or a spec, and allow people a way to store and transact without relying on a custodial holder, with all the extra regulation burden. Point is though, government and law enforcement don't want that, because with that, it becomes a great deal more difficult to follow the money, or to get away with things like mandating everyone report money movements over some amount to the tax authority; something easy to do when it's tacked on to the condition of maintaining your license to do business. Every money transmitter being well behaved and integrated with the state maximizes the risk for anyone attempting to utilize the financial system for illegal activity.
Ergo... What you think of as already solved isn't "micropayments". It's traditional finance in the U.S. What we refer to when we say Micropayments, is a way to store value, maintain accounts, and run point to point transactions "blessed" or recognized by the world et al without an intermediary.
Yeah I don't think that worked:
https://marker.medium.com/how-russian-oligarchs-stow-away-th...
There's a reason I'm doing anything possible to avoid going back into finance. I never developed the knack to just sit back quietly doing stupid things that don't work for the purpose everyone says it's for.