Thank you for taking the time to reply, Dmitriy. Please understand I’m trying to make Blynk (more) successful (in addition to serving my own selfish needs).
I alluded to the Apple Developer Program in my Blynk Developer Program topic. This program allows developers to invite users to test their apps. A developer can invite up to 10,000 external users to test their app using only their E-mail address. Testers are prompted to install (one time) the TestFlight app from the App Store on their iOS device. How would the TestFlight app differ from the generic app you’re describing?