Sybil resistance is important in any sort of UBI system that preserves privacy, which may or may not be important. I like the idea of a privacy preserving UBI, and feel like it's definitely a lot more equitable than having it based on existing passports, or bank account numbers, or something like that.
This is valid. But even if we reduce scope to a privacy-preserving UBI, nothing Worldcoin solves the core hurdles thereto. It's solving a side problem tangentially related to those involved with a privacy-preserving UBI, but entirely germane to an a16z-style crypto pump-and-dump.
Adjunct: how is Worldcoin privacy preserving? At least with Bitcoin you can plausibly deny ownership of a wallet. In a world on Worldcoin, every traffic stop lets the cops inspect your bank account.
To the degree Worldcoin is doing anything to UBI, it's in tarnishing its brand. (Identity verification is not what's holding it back.)
If they were serious about this as anything but another crypto pump-and-dump, they'd focus on direct foreign aid.