This is Coinbase's DeFi lossless illiquid mining program, launched just this year.
Can you refer me to a legit information link from the Coinbase? can't find any.
You can look it up on Google. It can't be a scam
I did, using the keyword "Coinbase's DeFi lossless illiquid mining program" which it lead me to
REDDIT: Lossless liquidity mining pledge-free. and it is indeed a scam!