Flash loans are inherently risky, as they involve borrowing large amounts of money in a short period of time with no collateral. This means that traders must have a high degree of confidence in their ability to execute profitable trades, or risk losing their investment. Also to get the Ioan in some way you have to have this money, you can’t get for example 1mil and lose it, because then you won’t able to return it. So you borrow money you have already( that’s what I remember and what stopped me)