More than half of Americans are on TikTok. But for the first time in the app’s history, its user growth is stagnating—just as TikTok finds itself mired in battles with U.S. lawmakers and the world’s biggest music company. Stalling growth could be bad news for the company, which relies on advertising for its revenue. WSJ technology reporter Meghan Bobrowsky tells host Alex Ossola what this means for TikTok’s business.

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