What exactly is difficult about detecting direct copies of just those three sites? Because that's what's out there: exact copies. If Google isn't filtering those out, it's because they don't want to.
Google Search is most likely an incredibly complex engineering feat with many moving parts.
Unless you provide me with your qualifications and/or previous experience that would lend credence to your claim, I will view your claim as one from an armchair critic/engineer.
Unless you provide me with your qualifications and/or previous experience that would lend credence to your claim, I will view your claim as one from an armchair critic/engineer.