we can not count how many people are with bitcoin because everyone who wants to invest in it can be important to earn a great deal and because bitcoin is so famous so more investors invest in it so we will not know how many have bitcoin today.
Right I agree in your opinion we don't know how many people using bitcoin all over the world all I know bitcoin is very popular and more people wanted to join here, cause bitcoin is famous and more investor's invest here and want to earn more profit. And it's hard to know the exact number on how many people invest in bitcoin.