Since there's been no response to my post, I'm going to guess that no one who read this understands what I was trying to describe when I was talking about rectangular ads? If that's the case, I'll use this thread as an example to describe them:
When viewing the Purse Forum when not logged into the forum, there are 3 rectangular ads that automatically appear on each page of a thread - the first 2 ads appear on the first 2 posts at the top of each page, and the third ad appears on the last post at the bottom of each page of a thread.
For example, my current post will be the last post at the bottom of this page and therefore, a rectangular ad will automatically appear underneath my post when viewing the forum when not logged into the forum. I didn't put the ad underneath my post because I never put any ads underneath any of my posts. The Purse Forum website administrators set up a structure on the entire Purse Forum website itself whereby these ads (which are sometimes also called Google Ads) automatically appear underneath posts. These ads sometimes have a small triangle at the top or bottom right-hand corner of each rectangular ad, and when scrolling over the triangle, small words that say "Ad Choices" appear. I don't know what "Ad Choices" means. I'm guessing it means Google arbitrarily listed the ads themselves.
The ads appear at any time when viewing the Purse Forum when not logged into the forum. The subject matter of the ads vary quite broadly - from clothing to movies to jewellery to whatever. I don't know what the ads are.
Lastly, what I wanted to politely say to Vlad and Megs (since they are the Purse Forum website owners) is if Vlad would consider the option of putting these ads in an area away from the posting area, outside of the posting area. As I mentioned in my previous post in this thread, I think that in principle, it doesn't feel right to let advertisers arbitrarily automatically put ads underneath posts. It's no different from sticking a sign on your front lawn without your consent.