Not saying I agree that being closed source is in the public good, although one could certainly argue that accelerating the efforts of bad actors to catch up would not be a positive.
This is exactly the problem having an open non-profit leader was designed to solve.
Six month moratoriums, to vet and mitigate dangers including outside experts, would probably be a good idea.
But people need to know what they are up against. What can AI do? How do we adapt?
We don't need more secretive data gathering, psychology hacking, manipulative corporations, billionaires (or trillionaires), harnessing unknown compounding AI capabilities to endlessly mine society for 40% year on year gains. Social networks, largely engaged in winning zero/negative sum games, are already causing great harm.
That would compound all the dangers many times over.