Some people think and market Satoshi Nakamoto was solving the "byzantine generals' problem" by creating Bitcoin. But this is not true.
In a continental and global conflict (war, repression) it is possible to put a lot of people - billions - off the internet. And also natural desasters like solar flares can do harm. The solution of the "byzantine generals' problem" is not an electronic or internet solution.
But:
It is very interesting to see, that a lot of blockchain developers are working on offline blockchain solutions!
Back when I was a kid in the 60's there was a project called "Radio free Europe"
https://en.wikipedia.org/wiki/Radio_Free_Europe/Radio_Liberty.
It is still around look above. I would think that EFTbitcoin's idea of using a satellite for internet or blockstream could fall into this idea somewhat.
So the restrictive places in the world would still have some access to BTC and other coins.