From the HN guidelines:

> Please don't complain about tangential annoyances—e.g. article or website formats, name collisions, or back-button breakage. They're too common to be interesting.

Tons and tons of sites have annoying popups. As such, complaining about it is usually off topic; that is, the complaint has nothing to do with the substance of the specific article that was posted for discussion.

The best place for such a complaint is to send it back to the website publisher. Then at least they will know their audience doesn’t like it.