Cryptocurrencies were meant to be means of payment; their repurposing as long-term investment has always been criticized by economists.
cryptocurrencies superiority comes from its neutrality a) as a store of value and b) as a medium of exchange of value. neutrality is meant in a way that they are free from an appraisal of a single authority. these authorities can be banks, governments or service providers.
it is yours as long as you have the keys.