My general problem with cryptocurrency is their environmental impact / resource usage compared to traditional payment systems.
I dunno, been seeing quite a few posts from https://indieweb.social/@web3isgreat that do kind of give a bad impression…
Those already exist! Pretty hefty price (compared to your usual ereader) but very much useable. Onyx Boox has a few models iirc
Well, on the other hand, do you just understand how simple cards work? I for sure don’t and I don’t see why I would need a chip from my provider to access it’s services, if I can get a digital key instead.