No single person or entity gets to issue bitcoin. They are mined by a global network of computer nodes that anyone can join and contribute to. There is no single point of control or failure.

And they are not created from thin air. They are created by the network brute force guessing the answer to inhumanly complex math puzzles, quadrillions of times per second. The electricity (physical energy) expended to do this is where bitcoin's backing comes from. It requires more energy to mine a single bitcoin block than to pull gold or silver out of the ground.