And before anyone tries to make a stock market comparison: No, this isn’t the same as stocks.
Stocks are, literally, partial ownership of a company. A shareholder owns part of the underlying company, including everything from their bank balances to their brand.
Bitcoin would be like subtracting out all of the valuable parts of a company and leaving nothing but the shares behind. You get an entry in a database (the blockchain) and nothinf else. Literally the only thing that gives this database entry any value is the ability to convince someone else to give you money in exchange for it.