Yield needs to come from somewhere, there are no such thing as free lunch. They might be happy, until 1 day they wake up and Tethers becomes worthless. I'll stick to "pathetic" fiat.
From the borrowers, similar to a traditional bank
https://aave.com/
Or you can go with a cefi platform such as Gemini, BlockFi, or Celsius, but the concept is the same as on the defi platform
Some defi platforms like pancakeswap give much higher APY's, for providing AMM services (LPs) for coin-pairs trading
Pancakeswap also provides over 100% APY on staking the CAKE tokens (if compounded daily or on a regular basis), but that comes from inflationary token emission. Comes with a higher risk but obviously higher rewards. I'm holding and staking over 6 figures $ amount of CAKE
https://pancakeswap.finance/pools