Amid an arms race in which the biggest tech companies are raising and spending tens of billions of dollars to gain AI supremacy—in part by making their bots feel more human—they are also grappling with the ways their products can encourage delusional thinking, psychosis and other troubling behavior.

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Apple’s market share of digital music subscribers in the U.S. fell to 25% at the end of last year from 30% in 2020, according to MIDiA Research, while Spotify’s share increased to 37% from 31% over that period.

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