If MegaSpeed (or any quantity buyer of GPUs in Asia) held all required licenses and met all U.S. export and KYC regulations, selling product to them was legal.

If a legally authorized customer later breaks the law, that doesn't make the supplier guilty of something they didn't do. It means the regulations and enforcement are ineffective. MegaSpeed has apparently been extensively investigated by both the Commerce and Justice Depts for some time and no charges have been filed so far. If the US Govt suspects MegaSpeed is a problem, they can add them to the blocked entity list at any time with no evidence or justification.

Frankly, I agree that someone in Asia has been diverting GPUs. But the US Govt has all the power here and can block anyone they want. If NVidia was knowingly violating export controls by back-channeling GPUs, that's serious jail time and personal fines up to $1M per card. These things have the same penalties for export violations as cruise missiles - and the same national security investigative powers. If NVidia was under suspicion, spooks have been reading all NVidia's company and personal emails and texts, tapping phones, bugging conference rooms, etc. If NVidia was knowingly subverting U.S. export controls, we'd be seeing arrests and perp walks not anonymous leaks about who Jensen's banging.