[1] https://taler.net/en/index.html
I also think that the GNU association keeps this project back, because it makes it look like foremost a software project. I think a more "political" stance with the software development attached would help it a bit.
Still, it's a very hard field to get into. Money systems don't get introduced and used on a whim.
So, having made that confession, I doubt whether the network effects will render Taler vaiable in anything but the most niche situations.