Bitcoin has become a scarce commodity because there is a limited supply and fewer mined each year. The original demand is built from it being a way to store funds and a way to send funds anywhere in the world without relying on a bank or government. Also the anonymity of Bitcoin attracts users that dont want banks and governments to control their money.
from my views the such demand for bitcoin is because of the price of bitcoin which was countinously increases and also increase in the future also which attract the people towards self. Bitcoin helps the people for online transaction and transfer of money from country to another country without involment of third person therefore the demand for bitcoin towards the people is increasing.