If that’s not enough to convince you to toss interstitials in the bin and never look back, there’s also the fact that users report these interactions as among their most-hated advertising practices (defined as ‘modals’ in this study by the Nielsen Norman Group). On a one to seven scale, modals (interstitials) landed at 5.82 for desktop users and 5.89 for mobile users, beating even autoplaying videos without skip for most-dreaded advertising type.
You can use this strategy to your advantage and increase your email list by giving people an incentive in return for their email. The giveaway could be free access to an e-book, a report, a gift hamper, or perhaps a lucky draw where people enter their emails and get a chance to win. A tantalizing offer is all you need for people to comply. For example: