Here’s a quick UX tip for better SEO too.
Google doesn’t like interstitals. These are pop-ups taking up the whole screen, hiding a site’s content, that force users to dismiss it. They are often used to get email addresses or provide a final offer during exit intent.
There’s an easy way to achieve the goal here… replace the interstital with a banner showing at the top or bottom of the site. This improves UX yet still promotes awareness for a newsletter sign-up or discount code.