As much as everybody hates on OpenAI for chaotic management, they did buy Jony Ive and are presumably giving him everything he wants to build a platform for them. Even though it probably only buys them a 20% chance of success, they haven't doomed the project by underestimating what it takes budget-wise.
And they blew it. Maybe they blew it by not realizing that even long time Apple employees could get arrogant about security. Or maybe it was a loose ethical environment in general. Whatever is it the root or the problem, they set billions of dollars on fire maybe tens of billions, by being unnecessarily cute about Apple proprietary information when they could've been above reproach. They had the resources to hire all the right people with the right knowledge and probably already had them on board.