Is there any way to find out what the ad networks think my interests are and why they are showing me such ads?

Google gives hand wavy general reasons such as those found here: https://support.google.com/accounts/answer/1634057?hl=en

But I'm interested in knowing what specifically the ad networks think I am interested in and why they think that.

I found this page which gave a rather fascinating insight into what Google thinks my interests are and what my demographic profile is: https://adssettings.google.com/authenticated It was remarkably accurate except for a few things, but it did not indicate I have any interest in the ads that Google is showing me on this topic. So I'm puzzled as to why I'm seeing these ads - what bit of the Internet is concluding this is a topic of interest to me?