- OpenAI can easily not become anything of significance in the future, even if the OP's prediction of the future becomes reality. I'd argue that being bought by a government and controlled within the ethical confines of that government would be a great way for OpenAI to quickly fall behind its peers who aren't subject to such regulations (which is the entire point of this post in the first place).
- Norway may be a great country ran by a great government, but that doesn't mean they would be a great leader of some AI revolution. Not only is the bar for being a competent government not particularly high on the world scale, but the skills of a competent government don't necessarily translate to the skills of an AI revolution Sherpa. I don't see why the OP feels Norway wouldn't use an advanced AI to simply enrich itself while leaving other countries to fend for themselves. It's not like Norway's fund is designed to serve the rest of the world as it is, nor is it the case that Norwegians would allow their government to serve other countries at the cost of their own well being.
- Those at OpenAI would either (a) never entertain this offer or (b) would sell to Norway if this exact thesis wasn't true (i.e., they'd be happy to sell if they thought OpenAI was going to become worthless anyway). Using the logic that the Norwegian Government Pension Fund Global can just buy OpenAI because it has more money than a given valuation for OpenAI is embarrassing. It lacks any understanding of how businesses and investments work, let alone how investments in these specific businesses work. I mean, the OP starts this post off explaining how they think OpenAI can effectively rule the world once their expectations for their technology is realized. Why would they sell their ticket to unlimited wealth for a relatively small offer?