A report released last week contends that Amazon uses voice data from its Echo devices to serve targeted ads on its own platforms and the web.

The report, produced by researchers affiliated with the University of Washington, UC Davis, UC Irvine, and Northeastern University, said the ways Amazon does this is inconsistent with its privacy policies.

Titled, “Your Echos are Heard: Tracking, Profiling, and Ad Targeting in the Amazon Smart Speaker Ecosystem,” the report concludes that Amazon and third parties (including advertising and tracking services) collect data from your interactions with Alexa through Echo smart speakers and share it with as many as 41 advertising partners.

That data is then used to “infer user interests” and “serve targeted ads on-platform (Echo devices) as well as off-platform (web).” It also concludes that this type of data is in hot demand, leading to “30X higher ad bids from advertisers.”

The company also confirmed there are targeted ads on its smart speakers. “Customers may receive interest-based ads when they use ad-supported premium content – like music, radio, or news streams,” said Raemhild, pointing out that this is the same experience if they engaged with that content on other channels.

She went on to say that Amazon does not share voice recordings with developers. “Developers get the information necessary to fulfill your requests within their skills, such as answers when you play a trivia skill or the name of the song you want to play,” she said. “We do not share our customers’ personal information to third-party skills without the customer’s consent.” Amazon allows Alexa users to opt-out of ad targeting as well (see sidebar).