Yes, flash loans are still possible. Flash loans are a type of loan that can be taken out and repaid within a single Ethereum transaction. This type of loan allows users to borrow funds without needing to provide collateral, which makes it an attractive option for traders. While Vitalik Buterin, the creator of Ethereum, has not explicitly forbidden flash loans, he has expressed concerns about the potential for abuse and has called for more research into the security of these transactions. As such, it is important to be aware of the risks associated with flash loans before engaging in them.
