The decentralized blockchain technology used by most crypto-currencies creates a completely peer-to-peer transaction system with no central authority. All transactions are recorded on a public ledger stored by multiple machines on the network. Traditional banks hate crypto because it disintermediates them (cuts them out of the loop).
The inspiration for creating a decentralized, peer-to-peer currency system is to remove the traditional banks that have shown themselves to be corrupt and reckless with people's money. At the same time, the U.S. dollar and other debt-based fiat currencies are designed to be inflated and thereby dilute people's buying power over time. Bitcoin operates with an ultimate fixed supply, so it can't be inflated the way modern fiat currencies are.
The value of Bitcoin is that it creates an alternative to the debt-based fiat currency system. I can put my money in a bank, or I can upload my money into a Napster-like peer-to-peer digital storage system. My money will be converted to the native currency called Bitcoin and stored in my digital wallet.
The problem with Bitcoin is that it's not backed by anything solid and real. A currency should really be backed by hard assets, or it readily creates a speculation bubble--meaning that people who get in early can make money from speculation, while people who get in too late will be left holding the bag (taking a loss). The market value of Bitcoin rises and falls as demand for it waxes and wanes vs. its fixed supply. As long as there is demand for it, Bitcoin will have value. If people abandon it, Bitcoin's value could drop precipitously, or even to zero.
People aren't really using Bitcoin as a medium of exchange or as a vehicle to preserve their wealth and buying power. They are treating it as a speculative asset to try to make profit. They know that the U.S. dollar and other fiat currencies are weak and getting weaker as the Fed continues to print vast amounts of dollars to create an artificial stimulus. When the value of 1 BTC = $50,000 USD, this is really an indictment of the value of the U.S. dollar and reflects its weakness.
The value of Bitcoin will continue to rise over time as people use it as a potential safe haven against a weak and volatile world economy. However, it too is highly volatile and can still be manipulated by really big players. I advised people to buy into BTC just over a year ago, when its market price was in the low $3k range. BTC had already established a price level at $15k that it was expected to return to. I don't know how I feel about BTC at its current price, though it should continue to appreciate and could readily pass $70k+ before the end of the year. The economic downturn caused by the pandemic, the Fed's addiction to money printing and increasing inflation will continue to create steady demand for BTC over the next year.