1) The Core Team That Develops The Currency Has Control
2) The Public Contributors Have Some Control
3) The Payment Network Itself Has Some Control
4) The Miners Have Some Control
5) The Cryptocurrency Exchanges Have Some Control (kind of...)

The key to understanding control of a crypto currency (via consensus and contribution) vs control of a fiat currency (via central banking) is simple.

A central bank has the ability to extract value from the people who use their fiat currency. They have a government with guns to enforce the use of the currency.

All the participants of a crypto currency can only create value for each other or the entire thing falls apart because there is no incentive to support the currency.

A failure to perpetuate the core ideas that make a crypto coin possible makes everyone involved poorer so there are many positive incentives intentionally built into crypto currencies that prevent everyone from becoming poorer.

I hope this was useful for you!