I saw an article today that confirmed what I have suspected for years now - mobile phones have been monitoring us and using the info to sell to advertisers:
https://www.bbc.com/news/articles/cr4rvr495rgo
Apple has agreed to pay $95m (£77m) to settle a court case alleging some of its devices were listening to people without their permission.
The tech giant was accused of eavesdropping on its customers through its virtual assistant Siri.
I remember testing this about 5 years ago to prove it to my wife as she was skeptical - I kept adding into our conversatons that we should got to Disneyland (I warned her I would do this as a test as it is somewhere we have no interest in going to) and sure enough we started to get adverts appearing after a week about the park.
I suspect the other big players (Microsoft, Google etc) are also up to this but are much better at hiding it or have added wording in their Terms and Conditions to allow it.
It is more than a little concerning.
