This is just crypto p2p lending, which is hardly new. Fraud is rampant in this space.
it's not, this is either overcollateralized lending like compound finance or dharma, or it's flash lending. You don't have to worry about fraud. edit: this line sheds some light: "Gemini is partnering with vetted and accredited third party institutional-grade borrowers including Genesis Capital". So they are lending your money to accredited parties, not random people on the internet.
BTC lending on the other hand (which Gemini is offering) must be custodial, so there's pretty significant risk of loss if Gemini gets hacked, seized, or otherwise looted.
To answer someone else's question on this thread, over-collateralized lending solves the "I want to buy Ethereum but all I have is Ethereum" problem. Most people use it at a really simple mechanism for adjustable leverage, letting them increase their risk exposure without losing custody of their assets.