https://vincmazet.github.io/bip/filtering/fourier.html
There are ways to encode images that make it easier to isolate differences in cropping and resolution and rotation. Like how if you wanted to search for color filtered images you could just throw out the color and compare them in black and white.
If you actually read the thing it's fine. It just requires phone manufacturers include a parental control function that is CAPABLE of those limits built in without charging extra for it. The parents still have to turn it on and can exempt apps from it or not set it up at all.
The most "authoritarian" part is online services with recommendations are "encouraged" (not actually required) to set up separate age algorithms. Algo for 3 year olds they recommend to be mostly audio and not ADHD video, algo for 8 year olds educational only, 12 year olds "positive" entertainment, 16 year olds "age appropriate". And they want app store recommendations to not advertise lootbox games at kids.
People can be banned from airlines but they get banned for the same reasons they do in the US, like getting drunk on the plane and punching someone. Or like how the US bans people who owe child support from getting a passport, judges in China are allowed to ban people with unpaid child support or big enough unpaid fines from state owned airlines until they pay.