Yes I was referring to Altman's "WorldCoin" eyeball-scanning scheme.

Spaces are in alpha and implemented in at least 4 PDS codebases. Until then there's a lot of use cases where world readable is not a problem, like personal blogs or instagram/twitter style social media.

I think a model where public really means public and private means private is more clear to users than a closed platform where neither is true. Facebook is actively using your private posts for ad targeting and they can remove your public content at any time for no reason. With atproto that can only happen if you pick a bad hosted PDS out of many.