Lots of people are doing it, it works, it's an easy way of dealing with people who think they don't give a shit, and once set up, very easy to add each Twonk.
You don't need to name them, YPLAC puts up the photos, so they must of found it legal,
It's easy, don't park where you shouldn't and no one puts a photo of your shitty attitude online,
In over 25 years of driving, I've never had a parking ticket or a speeding ticket, because I have never parked anywhere you shouldn't or broken a speed limit ( I use to do rally, but that was on forest tracks and closed roads), because I do care about the culture of crap driving, and the impact it has.
You can legally take a photo in any public space, you can put that photo on line, you can put it on FB, If someone doesn't like their vehicle being featured on a page with that title, they would have to prove that their chosen method of parking was not inconsiderate, selfish, dangerous, entitled parking , which from the photo it clearly is, so good luck with that would be my reply.
Start a thread in legal those clever people would know.
If you do, please ask if it would be legal to offer a removal of photo for generous donations to local charities deal, I would love to know, as that would be a great way of fund raising, but I bet that would have some legal implications.