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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The newsworthy aspect to this is that the AI hype cycle is saying that right now, today, Nvidia is cheap. If AI is going to capture the entire economy, but it relies on Nvidia hardware, the current valuation is pennies on the dollar of what it will be one day.
Except, you know, that's all a lie. And Thiel peddled it for a while, and is friends with Musk, and connected to many others in the hype cycle besides, and now he's showing his hand that he knows its a lie.