How interstitial ad affect SEO

FingerFlyer said:

Interstitial ads have nothing to do with your search engine ranking and unlikely to affect SEO, in addition to there not really being any way to measure their hurt to your site. So long as the search engine bots can reach your site's pages and there is no code preventing this, you will be fine. If you have recently noticed a drop in your search ranking, it is likely due to something else. Many famous sites use interstitial ad pages and still rank well. Some even have an interstitial ad page that you must click through before entering the site and yet still rank at first spot on Google.

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