> far fewer people in the world have a Bitcoin wallet. Could this be a mere matter of implementation of the design?

imho it has more to do with the fact that banks have been around for hundreds of years and Bitcoin is brand new.

What is the rate of Bitcoin wallet creation, compared with rate of de-unbanking?

That sounds like a fair question but could equally be disingenuous.

Is the rate of lack of use of bank accounts ever likely to be public knowledge? There's zero incentive on the banks' side to publicise that kind of information.

If it's not publicly available then your question sounds quite loaded.

> Is the rate of lack of use of bank accounts ever likely to be public knowledge? There's zero incentive on the banks' side to publicise that kind of information.

Public authorities can estimate this (FDIC in the U.S. has done so) and general trends should be evident (if half of previously unbanked Indians get bank accounts we won't need banks to tell us).

But fair - just the rate of Bitcoin wallet creation then? Maybe compare to global/country population growth.

Bitcoin wallet creation went from 1 million to 5 million since last year and it keeps increasing.

Thanks! For comparison, Indonesia's population has grown by around 2-3 million people per year over the last two decades; India's by around 17 million people per year; and the world's rate as a whole is about 70 million per year.

Those are absolute numbers. From 1 million to 5 million is a 500% increase. I doubt any nation has seen anywhere close to a 500% increase in their population numbers.