I have not closely followed what Worldcoin are doing, but am just not too interested. Of course people will always be up for 'free money', but we shall see if they can sustain it.
I did play with Grantcoin (formerly Manna) that was a form of basic income that anyone could get. I do not remember what KYC they had, but the project has changed a couple of times and I could not be bothered to sort out the wallet they are using now. It was only a matter of cents anyway.
Uniquely identifying people is a difficult problem and coming up with a scheme that cannot be abused is even harder. I like that on Hive you can be anonymous, but still build a reputation that brings some trust. Doing that across multiple accounts could be a lot of work and you would need to be careful not to leave clues that they were linked.