People always dismiss this as FUD but it's been happening to me more than ever. I know in many cases it is more likely that firms are acquiring purchase histories and location data but that doesn't explain other incidents.
For example, last week I was complaining to my spouse about shoulder pain and how I was afraid I may need another surgery. YouTube has suddenly starting flooding my feed with videos about "shoulder exercises to avoid surgery." I hadn't searched any of those terms, purchased anything or visited an orthopedic, so I don't know what else could possibly explain it.
It could have been something as simple as lingering on some kind of content related to physical therapy on a social media feed before scrolling past it, or maybe your wife googled it and it got correlated via network?
The alternative explanation is that your spouse searched up something related to your situation.
That’s the next possibility to eliminate.
I am positive I get ads based on the interests of other people the wifi where I live.