The reasons why so many persons invest in bitcoin is the depreciation, centralization and the appreciative aspect in bitcoin.
I believe this is not what you really meant, maybe the opposite because what entice people about bitcoin is the appreciative value and decentralization nature it's built with, everyone want to go private and secured, no Involvement of third party ir indescriminate charges deductions from users account, control and freedom over financial asset is what the people and this helps in giving bitcoin priority over the fiat currency in preference.