Bitcoin is controlled by its users. A distributed network of nodes around the world that run Bitcoin software makes it so no single person or entity can control the network. The simple answer to the question who controls bitcoin is no one and everyone.
How is cryptocurrency supply controlled?
Currency with Finite Supply\n\n The rate of block creation is adjusted every 2016 blocks to aim for a constant two week adjustment period (equivalent to 6 per hour.) The number of bitcoins generated per block is set to decrease geometrically, with a 50% reduction every 210,000 blocks, or approximately four years.
Is cryptocurrency controlled by anyone?
Cryptocurrencies are usually not issued or controlled by any government or other central authority. They're managed by peer-to-peer networks of computers running free, open-source software. Generally, anyone who wants to participate is able to.