Already this might have discussed. The growth of bitcoin as well other digital currencies keeps progressing with time. By the time common people too have begun to use cryptocurrencies on their daily life. Compared to the fiat usage, common people using cryptocurrencies were low. When the usage increases what will be the preference of common people. Whether it gets used as investment, gambling asset, trading asset, alternate payment, darkweb usage source.
considering the crypto space currently, Bitcoin is used in all aspect of the things you have mentioned above. People are either investing into it or trading, gambling and using it as an alternative payment option. There are no particular aspect which can be considered as to have the most increased usage.