Regulators led by Margrethe Vestager said they want about 400 companies to contribute to a report about how so-called internet-of-things devices collect and use consumer data.

The investigation follows years of relatively unchecked growth by technology giants into wearable devices and smart home products.

Vestager’s probe is likely to examine issues such as Siri’s preference for using Apple Music rather than Spotify Technology SA’s service, and Amazon could be questioned on why Alexa won’t let users change their default grocery delivery provider to a rival.

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