This could be just the start of a broader trend in big tech.

Nvidia ( NVDA 1.68% ) has seen its fortunes rise on the back of surging demand for artificial intelligence compute. Its graphics processing units (GPUs) stand out as best in class when it comes to AI training and inference , which has resulted in soaring prices for its chips as big tech buys up supply as fast as Nvidia can make them.

Thanks to its technology lead, Nvidia commands a market share of around 80% of all AI chips for rent on cloud computing platforms, according to estimates. And that might only be limited by its ability to supply enough chips to its biggest customers.

But one of those major customers just signed a deal that could signal that dominant market share is under threat. And if Nvidia's other

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