@algimantas I can explain to you why that system won't work if you'd like. But if you're interested in building some actual cutting edge stuff please feel free to hop over here and join us
https://steemit.com/introduceyourself/@williambanks/announce-steembots-com-your-source-for-everything-bot-related-now-hiring
For everyone else, a pixel by pixel scan won't work for photoshopped images since you would need an enormous training set to make something like that work and classifiers don't work that way anyways. Also it doesn't stop someone from hiring their niece or neighbor to hold up a sign for a cookie and a glass of milk.
There is a way to catch these guys and it doesn't actually involve looking at photos at all.
Keep supporting @cheetah he's doing a good job and @anyx is actually a qualified builder with serious skill. Perhaps stop by STEEMBOTS for some details about how AI actually does work in the real world. Also @dana-edwards is a great source of info if I'm dumbing it down too much.