If you had the opportunity, would you do it?
For example, you buy 1 Bitcoin for 8000$ and sell it for 8800$ but the money goes to your Paypal account?
And you could do it over and over again?
yes, that's what it means to trade, but it's not as easy as you think. there are many factors and research that you should do and if you do not do then you can get stuck.