It is because I do still do believe Bitcoin up to now is not controlling by any country. It is still decentralized not centralized.
You are totally blind. Bitcoin is fully centralized.
Bitcoin is controlled by a few people (about 4) who work for Blockstream who easily manipulate large Chinese miners (about 5).
If an actual open vote occurred with the top 10,000 most sophisticated Bitcoin users, we would have switched to large blocks a long time ago. Satoshi expected 10,000 sophisticated users running voting nodes by this point. However, mining became highly concentrated and centralized and now Blockstream has found a way to 'rope them in to their plan'.