No one can force you to use money either. You can chose not to partake in any financial transactions and starve to death. According to the logic above, we just

No one can force you to use money either. You can chose not to partake in any financial transactions and starve to death. According to the logic above, we just established that financial system is 100% voluntary. You can chose not to ever fly on an airplane. According to the logic above, it's just a convenience. Nevertheless, people generally don't dismiss issues with air travel by saying that you can just chose to drive. In reality, a lot of the systems you think are essential to your day-to-day life are technically opt-in. Except you cannot opt-out without cutting yourself off from the society. Also, societies are not established by armies. They are established by social conventions with enough clout to become self-sustaining. The Internet was originally established in a way that was very different from the current version of an offline society with its hyper-centralization and authorities. But the consolidation of services and infrastructure significantly changed that model.