You are right and that is why we can never get an accurate representation of how many people are actually using or owning bitcoin. Due to its decentralized nature, it’s difficult to determine where and who from each transaction is taking place. The only data we have is from those centralized exchanges.

Every time a country bans something, they are actually not getting rid of it. They are just illegalizing it. Some people are brave and still risk being penalized by the government just to use bitcoin