The reason it expires is because it's like a calculated bet. Think of it like betting against your friend that a certain event will happen by the end of the month. If it happens, you make money, if it doesn't, you lose. At the start of the next month, you can enter a fresh new bet.
Crypto markets are very volatile. Don't trade them unless you are willing to take a lot of financial risk and have studied the markets for at least a year
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