There are few reasons why trader would want to use flash loan; such as traders employed flash loans to speculate on new coins without risking their own funds. Other than that, flash loans bundles several transactions into one so traders can reduce transaction fee. Plus, as it names suggest, flashloans are instant and it is very much needed in fast-moving crypto space. Traders also utilize flash loans looking to quickly profit from arbitrage opportunities. So, eventhough flashloan are an innovative new feature, there has been multiple abuse as hacks sobe sure to DYOR and understand it fully before using it.