I am one of the living proof that i actually receive the free $25 worth of XLM from the airdrop + this coinbase earn platform for qualified accounts.
You should check your coinbase account and see if the offer is available for your account.
Firstly, I congratulate you because you got the $25 free money via XLM from Coinbase.You should check your coinbase account and see if the offer is available for your account.
Secondly, joining their give away on Coinbase or not depends on personal perspective. There are so many topics, and discussions that crypto enthusiasts should join such give away, not only from Coinbase, but also from Blockchain or not. It's hard to judge which sides of perspective is right. Both of sites (Coinbase, and Blockchain) are giants in crypto and highly trusted. So , it's save to join and do KYCs. However, all things will change if bounty hunters join give aways run by small sites, please be careful with KYC requirements from them.
I have a verified account in coinbase even before the Coinbase earn page was launch, So its a no big deal for me since its basically a free money
As for the blockchain.info airdrop i took the gamble and finish their KYC to get the free $25 XLM,. Both platform are highly trusted so i got no reason to refuse their KYC to receive free gas money