Scammers are everywhere, no matter which blockchain the project is running. As the projects can be created without any clearance or license there is always chance of scam, fraud, rug pulling or cheating so there is always a chance and risk here.
But BSC has a clear advantage in this scenario because the fee that is needed to run a single transaction is small compared to ethereum or the others.
to successfully create a project and to scam people, the developer needs to run a few round of test to make sure the smart contract works as expected.
so this is not wrong to say it this way, be careful in choosing a DeFi project because it is an upgraded scheme of ico scam using a high roi as the bait.