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And for the record, the prompt is explicit about the risk: "All network activity on this iPhone may be filtered or monitored when using VPN."

And you get a big "VPN" status icon that's at the top of the screen the entire time it's running.

But is really common user reading these warnings?

I know that without it we wouldn't have amazing apps like https://itunes.apple.com/us/app/adblock/id691121579 , but i'm really not sure if its worth that risk for a common user that apple mostly targets with iOS.

Total noob question: is it possible for iOS app to fake/emulate that system prompt to ask your passcode?

It certainly was possible https://arstechnica.com/information-technology/2017/10/bewar...

Not sure about the current state though.