OK, let me try another angle, because IMO fiat money is more complicated than bitcoin.
You are making money from holding bitcoin, or you have a chance to make it in the fiat world.
With bitcoin all you have to know is how to secure your coins and how to transact with a wallet which isn't much more difficult than using a bank app on your phone.
Oh really?Let's compare using a card with a wallet!
I enter the store, I put my groceries on the table, I swipe my card , I'm out!
With btc, I enter the store, I go to the cashier, I have to see how much that is bitcoin, I have to input the amount, select the fees, have to look at the mempool, be careful for the value not to slip as I might underpay...
Are we even comparing the two?
The only solution to make it simple would be a 3rd party but that would kill the idea of p2p!
Some need to understand that BTC was not designed to be easy to use, it was designed to be a p2p currency, just as how torrenting isn't as easy for the average Joe as pushing the Netflix button on the remote, Bitcoin isn't as easy to utilize as a credit card for the masses!
When you choose fiat money you have to set up a company, get a name for the business and register it. You have to prepare invoices for your clients, get a credit card terminal, a safe to hold cash, a printer to print receipts. You need an accountant that will do all the paperwork for you once a year when you have to file taxes. You have to manage money that you hold in the bank because if they just lay there you'll lose at least 5% a year... Isn't bitcoin simple compared to that?
It's the same paperwork and even more if you accept Bitcoin, you still need a company, you still need a business license, you still need to file taxes and an accountant! What you're suggesting is working unlicensed and doing tax evasion!
But let's drop the obvious arguments!
If BTC would be that simple, and if we have 20% of the population owning crypto, why don't we have even 1% of the shops in major cities in the Western world accepting crypto? Pretty obvious answer!