Google, Microsoft and Amazon have made deals with A.I. start-ups for their technology and top employees, but have shied from owning the firms. Here’s why.

In 2022, Noam Shazeer and Daniel De Freitas left their jobs developing artificial intelligence at Google. They said the tech giant moved too slowly. So they created Character.AI, a chatbot start-up, and raised nearly $200 million.

Last week, Mr. Shazeer and Mr. De Freitas announced that they were returning to Google. They had struck a deal to rejoin its A.I. research arm, along with roughly 20 percent of Character.AI’s employees, and provide their start-up’s technology, they said.

But even though Google was getting all that, it was not buying Character.AI.

Instead, Google agreed to pay $3 billion to license the technology, two people with knowledge of the deal said. About $2.5 billion of that sum will then be used to buy out Character.AI’s shareholders, including Mr. Shazeer, who owns

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