So once 21 million Bitcoin have been mined, that’s it. The game is over.
Op the 21 million BTC will never be mined because they can only be mined when there is demand and supply. If there is buyers and sellers Miners are always be there to mine the coins for the people so the only thing that can stop bitcoin transaction is when nobody buys and nobody sells there every thing will stop but lolz that can never happened.
-except for China at this time, can purchase Bitcoin, utilize BTC, and store Bitcoin with specific, anonymous, keys.
Op how? Can you put more highlight on this point? You said bitcoin is decentralized which makes it out of authority control but you are saying that "except China". How? You mean China can control bitcoin? Op bitcoin is value because of it decentralized nature which restricted people to control it and you as an individual control your coins.