The parking garage one can be really insidious. The parking apps where I live in Canada have a terrible design; you absolute cannot start parking session without an account that requires you to input name, address, phone number, and then the app itself has other technical glitches that genuinely made me wonder if I had been scammed.

What makes it doubly so is that the parking companies have been removing the parking machine terminals in some locations. The Royal BC Museum in Victoria BC comes to mind last time I was there. I'd be surprised if someone hasn't at least tried a QR code scam on it by now.