From my interpretation (which I think would match that of an attorney at the PBC):

1) Legally Enforceable: periodic self reporting of public benefit related activities 2) Not legally enforceable: the detailed scope and actual delivery/implementation of said benefits. Third party auditing

i.e. if you try going and suing OpenAI, Anthropic etc. on their stated public benefit contradicting the severe impact datacenters are having to water/electricity in some areas, im quite certain that you would lose.