“Apps where during that onboarding flow inside the app they do collect an email and the user doesn't immediately subscribe then within minutes they're pushing an email and maybe it even drops down as a notification while they're still in your app saying hey come to the web and save 30% or 40%.”

Collect Email In-App During Onboarding — Then Push a Web Discount Before They Leave

Apple's rules now clearly permit using any contact information collected inside the app to market to users outside it. An email collected during onboarding can trigger a discounted web offer within minutes — even while the user is still active in the app. This creates a fast-follow funnel that captures users who hit the in-app paywall and bounced, converting them at a lower price point via the web.