They are not supposed to do that.
The site does not allow that.
Ads that do that can be reported to chess com. https://support.chess.com/en/articles/8647548-how-do-i-report-a-bad-ad
ad pops up during game
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During a recent game I was playing, an advertising video popped up, covering the whole screen including the board. It was very confusing, and I didn't understand what was happening, which wasted game time.
I'm fine with the site having ads, but why would the site let those ads interfere with games?