Saying “process voice for ads” has subtle connotations in the current landscape of privacy discussions.
There is an argument that this is more privacy conscience than other ad platforms. One needs to say the word "Alexa" before Amazon will collect any potential targeting data. There is an active and distinct choice that must be made before every interaction. That isn't true for Google and Facebook. They will collect data in the background while you are doing other things. There is much less transparency in when and how they are collecting their targeting data and therefore we have much less agency in the process.
> We find that Amazon processes voice data to infer user interests and uses it to serve targeted ads on-platform
Amazon has publicly stated that it does not use voice data for targeted advertisements [83], [75].
https://www.nbcmiami.com/news/local/are-smart-speakers-plant...
They're using skill interaction, order history, listening history, etc to target ads.