Unlike the old "guarantor" system where a licensed professional or public official (judge, lawyer, doctor, etc.) had to sign your application - basically, people who the government could verify the existence of and hold accountable - there's not very much traceability to the photo system.
As an American immigrant to Canada, I don't see the point - the US has never in my lifetime had either a professional photo requirement or a guarantor requirement for its passports, nor even a digital requirement.
Certainly, paying someone like a pharmacy for passport photos is not rare in the US to reduce the risk of out-of-spec photos leading to a rejection. But that's just a common personal choice and not obligatory.
I suspect Canada's guarantor system is inspired by the UK's, though I don't actually know.
https://en.wikipedia.org/wiki/2004_Israel%E2%80%93New_Zealan...
But it's safe to say that if they were caught once, they've probably done it numerous times.
I'm sure they also have automated tools for detecting photo manipulation.
The whole process for getting an NZ passport is an order of magnitude easier than a European passport. Here in Australia I was able complete the entire process online, and they couriered my passport to me from the Sydney consulate. I also have a passport for a European country, and last time I renewed it, I had to make an overnight trip to the consulate and spend half a day getting my passport renewed. I needed to get my photo done by an approved photographer, and they also scanned my fingerprints to store in the passport's chip (they don't store fingerprints for NZ passports).
[0] https://en.wikipedia.org/wiki/David_Garrett_(politician)
[1] https://en.wikipedia.org/wiki/New_Zealand_passport#Use_by_Is...
Disclaimers: it’s been 6 years and 2 years since I’ve had to do this.
They have a specially kited photo booth, where you also leave two fingerprints for additional biometric verification.
In order to renew your passport you need to schedule an appointment withyour local passport office.
Last time I renewed, 2013, it took 7 weeks until the earliest available appointment, which was a bit surprising. I'm sure, though, there's an emergency shortcut for a price.
The new passport arrives two days later by mail.
> Such manipulation of photos is typically invisible to the human eye, the researchers found.
[1] https://www.poliisi.fi/passport/passport_photo_instructions
https://lupakuvienvastaanotto.fi/Default.aspx
E: not to mention that the page you linked doesn't even say anything about prohibiting self taken photos.
After having my photo taken at the police office for at least my two latest passports it's somewhat surprising to hear about so many countries still using "the old way". There are such obvious advantages both in security and convenience by having the passport issuer take the photo and the technology is obviously available.