what about Passports from Brazil, Russia, India, Korea, Argentinia, Nigeria? I guess they all have likely less secure standards no matter that they are PKD-Participants?... What if you introduce currencies for each of them anyway, on the condition that their registered passports get only ubi when ubic-participants holding secure passports validate and trust those registered accounts manually? Validation could mean approving how long those documents are legit and approving that the person on the passports picture was in private contact with them? So a participant for example from Russia would have a harder time to join and would have to ask for private validation and more intrusive private KYC in a telegram-chanel or discord-chanel, and would receive only UBIC when s/he is trusted by a legit UBIC-account (holding a passport of the current 28 allowed Countries). Trust could be limited to a few or even just one trust-connection each legit UBIC-Participant so that noone is able to trust multiple sybils.
Something like that could open up UBIC to a lot of additional participants?
Theoretically, all passports that follow the ICAO DOC 9303 standard and it's recommendations can join UBIC.
It is just that the implementation is moving forward slowly in some countries and some haven't done it right yet. This year we were able to add Iceland, Hong Kong and Spain and I expect that by 2030 a large majority of countries will be UBIC compatible. There are also a lot of other tasks that need to be done in the core and have a higher priority.
One of them is to get the voting done so that it will become possible to elect validator nodes. This will make UBIC truely decentralized which it isn't yet.