What makes you think it wouldn't change after Sam and Greg join the team? AFAIK the reason Microsoft scaled down their research division (including GPUs) was because they were no where close to OpenAI despite years of investment.
This is like a spacecraft research nonprofit working on faster than light travel promising Boeing 100% of the rights to any of their technology that's sub-light speed. I give even odds that they'll never achieve "AGI," or when it happens it'll be an incremental gain made by simply wiring existing technologies together that'll be obvious to any engineer competent in the field and thus easily duplicated.
The OpenAI nonprofit board does, AIUI. That means OpenAI can, in theory, cut off everything from this day forward (by declaring GPT-5 or whatever as "AGI"), but they can't cut off access to GPT-4.
