You're correct because dollar is a debt unit - an instrument of debtors liability created at a bank via loan contract. That's why you cannot create dollars here on the forum. However, bitcoin is just a dozen of binary digits. And those can be created everywhere by anyone. I did it here. You did it here. Nakamoto system does it. Thousands of crypto system as well. It's just that people give different names to those digits. Simply, whoever needs them digits can create them at an instant. So, why are you people spending tons of energy or money to get them?
you are not creating crpto currency on this forum
what you are not realising is money is created within its own monetary systems
EG the EU banks create EU bank notes in the EU system.
people do not just create bitcoin/cryto currency by just sending a tweat
it involved code and rules to actually have policy of control and rules of transfer.
if you dont know how monetary systems work. dont waste months thinking you can create money randomly .. instead actually learn where the money systems are and the mechanisms involved to create money in those systems
fiat is not just dollar.. there are hundreds of fiats. multiple different "dollars"
canadian, australian, sinagore, liberia
but they have their own systems
each crypto currency has its own network and system and policies too.. you do not create a crypto currency by just describing it on a forum