Oddbean new post about login | logout If you can easily convert BTC to local fiat cash in a p2p way it is permissionless. I can do exactly that at my local meetup (not that I would be selling).
Thats great, except cash is being gotten rid of, esp in the UK. Some places don't even except cash, this is a fast growing trend. So if you want to spend bitcoins you are left exchanging it for digital money, and that requires permission from your bank to fund your account from an exchange whether P2P or centralized..