I'd say he's wanting to lock in those gains.
Diamond hands are different when you're up 100s of millions on a single stock.
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They don't sell it, but they could if Nvidia started charging too much, and some of these are going into Meta datacenters instead of Nvidia.
Intel makes the Arc. It's probably the least viable competitor in that list, but the fundamentals are there, so some about of focus and investment could result in a viable competitor.