Answers below already explain some aspects how Bitcoin is not imposed by law and is very much evolving in a Darwinistic way from prior experiments in digital money, beginning with David Chaum, etc.

Bitcoin is also still evolving as it is not yet competitive with USD, as evidenced by the lack of mass adoption vs. dollar notes, dollar deposits and USDT tokens, due to its 6 to 10 times higher volatility. Bitcoin only sees some use as a Store of Value (hedge/investment), negligible use as a Medium of Exchange, and no use as a Unit of Account.

Therefore, the next step in Bitcoin's undoubted evolution will likely be some mechanism, system, and institution which give it the requisite elastic supply so its volatility can be competitive with the big nation state fiat currencies.