Why, that's even easier to understand: the law of supply and demand. When the latter outstrips the former, prices must rise. Else, the shelves go bare.
In your zealous desire to knock all things NVidia, you forget that they only sell the chips. The ones making the Covid-era windfall profits were AIB maker or, more likely, scalping resellers.
You fail to understand how the free market works. Any business can at any time choose to raise the price of their product. They don't for the simple reason that doing so generally reduces their net profits. Using some sampled data and some elementary calculus, any business major can calculate what price point maximizes a company's profits. And any public company which fails to charge this optimum price is shirking its fiduciary duty to shareholders, and may well wind up sued or worse.
No need to thank me; dispelling neo-socialist ignorance on the workings of the free market is everyone's civic duty!