According to Odaily Planet Daily, in response to Ethereum co-founder Vitalik's high praise for Celo, on-chain detective ZachXBT commented that he has yet to see a real user of Celo, calling it a 'ghost chain' integrated into the Optimism stack.
In addition, ZachXBT agreed with the views mentioned in the comments about Metal DAO and Celo leveraging the superchain mechanism to obtain OP ecosystem incentives.