Banks use and abuse our money and do charge others a big fee compared what they pay to us for the same money, making bankers more rich. Fiat is something that you can use anywhere, but looks like it hasnt more value or unable to grow, while bitcoin is growing has huge potencial, and cant be used everywhere yet, atleast not directly. Bitcoin has some issues to handle but the potencial of it is amazing, and currently you can get an daily income lending your coins and getting much more then banks does offer, some trusted exchanges providing this service already.
You got it all wrong man, abuse what exactly? banks never steal your money and if someone else does steal your money the banks pay from their own pockets, your funds are safe and slowly growing but governments can freeze them if they want to.
Only advantage bitcoin has over traditional banking is the blindness, bitcoin is literally blind and can't see who is using it.