Why is the borrowing rate for USDC lesser than lending rate on Optimism chian?

As one can see, that borrowing rates are around 2.85% and lending rates are 7.65% for USDC on Optimism Chain. How is that possible? Who pays the differential amount? Also, what is stopping somebody from borrowing USDC at 2.85% and lending the same at 7.65%?

I believe that is because of the incentives added to attract more liquidity on OP Mainnet.
On both sides certain incentives are given in COMP token as of now.

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