It's more to do with declining ad revenues. GDPR has a role to play, but so do ad blockers.
You're making nothing at all from 20-30% of your visitors, because they're blocking ads. If you're actually following the GDPR, then your average CPM for EU users has tanked because you can't track them and can't serve targeted ads without an explicit opt-in.
Your average revenue per page view is declining, so what do you do? More aggressive ad units and more of them. Popovers and interstitials aren't new, they're just becoming more widespread because many publishers are starting to get desperate. Your bounce rate will increase, users will eventually learn not to click your links, you'll push even more people to use ad blocking, but none of that matters right now because you've got revenue targets to hit.
You're making nothing at all from 20-30% of your visitors, because they're blocking ads. If you're actually following the GDPR, then your average CPM for EU users has tanked because you can't track them and can't serve targeted ads without an explicit opt-in.
Your average revenue per page view is declining, so what do you do? More aggressive ad units and more of them. Popovers and interstitials aren't new, they're just becoming more widespread because many publishers are starting to get desperate. Your bounce rate will increase, users will eventually learn not to click your links, you'll push even more people to use ad blocking, but none of that matters right now because you've got revenue targets to hit.