Placeholder text, 'coming soon' screens, Lorem Ipsum, and test data are dead giveaways that your app isn't ready. Reviewers are instructed to reject anything that doesn't feel production-ready.
What Apple said
“Your app includes content or features that appear to be in a beta or test phase. Specifically, we noticed placeholder text, 'coming soon' labels, and features that are non-functional. Apps must be complete and ready for customers when submitted.”
Apple expects every submitted app to be the version you'd be comfortable shipping to paying customers today. Anything that signals 'still in progress' — placeholder copy, disabled buttons, hardcoded test emails, empty screens — will trigger this rejection. It's not about your app being imperfect; it's about it not looking finished.
While you're at it — Apple also requires these pages for every app.
Fix this rejection, then make sure you're covered on the compliance side too. Apple requires every app to link to a hosted Privacy Policy, Terms of Service, Support page, and Data Deletion page. No link means another rejection — just for a different reason.