But to develop superintelligence, probably all you need is some computer science researchers and some fairly ordinary computers. How can you monitor those, verify that parties involved are actually following the rules?

I do not think this statement is accurate. It requires many, very expensive, highly specialized computers that are completely spoken for. Monitoring can be done with hardware geolocation and verification of the user. We are probably 1-2 years away from this already, due to the fact that a) US wants to win the AI race vs China but b) the White House is filled with traitors long NVDA.