My personal experience: I’ve been using Notion, not Notes. Google Cal, not Calendar. Things 3, not Reminders. WhatsApp and Telegram, not Messages (not to mention FaceTime). GMail, not Mail. Google Maps, not Maps…and the list goes on. I know at least in my (small) circle, people who’ve been doing the same. My point: (Most of) Apple’s apps are not preferred, and are unlikely killing others’, including this whiteboarding app.