9% is a way too big for a company that doesn't make much more they are spending. Let's take Binance as example, they are liquid and have money within the company ecosystem, so if they promised 9% as APY or APR, I will take it since they have the money mathematically and they can pay back but if it's another company that don't have liquidity and are depending in my deposit, I will not try their service even ones the chance of not getting your money will be high.

High rewards are one way to detect scams, they are usually referred to as investment scams where they tell you all sort of things to get back a particular amount after some period of time. It's not like they are going to lend the stake amount to other companies, they will continue to comply with the victim and ask for more until you finally comes to your senses before you realized that you have been scam and your money is gone for good.