For several months the Simple earn USDC APR on Binance was more than 10% for deposits of less than 100 USDC
In september due to the reasons which are not clear, there has been a massive decrease in the USDC APR at Binance
The APR for USDC is now approximately 7%
There are no tiered APR for USDC at present, though it may change in future.
So investors having a small amount of USDC will make less money staking.