LOL. "Fiat world". As if there is any choice. Grow up child
There's always a choice. The only thing tying us to the fiat world, is our voluntary contribution to it.
Being free is as simple as saying no to those who oppress our ideals, and having the balls to keep walking an unpaved road. Especially now, thanks to the great minds who gave us Bitcoin as an arme-de-resistance.
You realize BTC isn't legal tender? As a debtor, you can't force the creditor to accept BTC as debt payment. That means IRS, your landlord, the bank that holds your mortgage, stores where you buy food, clothes, etc..
As the creditor, you have to accept legal tender (USD) for all debts. If my tennants pay me rent in USD, I can't refuse and force them to pay me in BTC, bananas, gold nuggets, blowjobs or anything not legal tender.
This is the real world. Grow up and accept it. It not voluntary. Its a legal obligation.
There is no choice but to use fiat. You can barter between private parties but thats about it