Most money systems are forced deeply. You have to use the US dollar to pay taxes in America. You have to use the Euro in France. But the bitcoin voluntary system is different: You choose it.
No one forces you to use Bitcoin. There is no army demanding you accept it.
People adopt Bitcoin because they believe it is better money. They migrate their wealth from a system that is inflating (fiat) to a system that is scarce (Bitcoin).
It is a peaceful revolution.
For the first time, we have a free market for money. You can vote with your wallet. If you prefer a currency that governments control, keep your dollars. If you prefer a currency that code controls, buy Bitcoin.
This freedom of choice forces governments to compete. If they abuse their currency too much, people will leave.
The bitcoin voluntary nature means its success is driven entirely by merit, not by coercion. It wins simply because it works better.