One nice thing I can say about the App Store is that Apple doesn't require you to publicly list an email address for your app. Google does require that on Google Play, and as far as I can tell doesn't encourage anyone not to harvest, collect, sell, and spam those addresses.

So after years of emails from app marketing firms, mobile ad networks, app localization services, app publishers who are just looking for no-cost content, and occasionally a customer threatening me with a one-star review, I list email addresses like this.

A benefit of this is that anyone who is not a bot and wants to talk to me will go to the website like I originally wanted them to.