I don't think the primary concern is really liability although it is possible that they'd use that kind of language. The primary concern is likely GPT helping people start competitors or GPT influencing public opinion in ways either executives or a vocal portion of their employees strongly disagree with. A genuinely open "unaligned" AI would at least allow anybody who has the necessary computing power or a distributed peer to peer network of people who have the necessary computing power to run a powerful and 100% uncensored AI model. But of course this needs to be invented ASAP because the genie needs to be out of the bottle before politicians and government bureaucrats can get around to outlawing "unaligned" AI and protecting OpenAI as a monopoly.