I think the reason why bitcoin can be exist till now because there's so many people who support in bitcoin, so many people still believe bitcoin can give them a lot of profits that's why they always investing in bitcoin till now. Bitcoin as cryptocurrency that people fall in love to I guess, lol.
I also believe that most of the people believe in bitcoin and this is what the majority of people are investing and it is also their favorite work, perhaps due to those people spreading bitcoin, due to bitcoin, they make a lot of profits gets it.