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The answer to your actual question "Why are most of the broker popunders actually popups?" is "because they don't keep testing their script as browsers update".
I had a self written pop-under code on some small sites which worked a year ago, I just had to check it for the first time in a year and now it doesn't work in Chrome and FF, still works fine in IE (go microsoft!)
As browsers upgrade it needs constant checking and revising. Big tube sites seem to always have popunders that work, I guess they can pay people to check all the time and rewrite the scripts as necessary.
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