~snip~
Because, in the first place, KYC is a comedy. I bet it is not only KuCoin and Huobi that would fail on this.
I don't know how these companies verify names, addresses, documents, IDs, and so on. Others claim that they have a system that detects fake documents. I highly doubt it. I guess what they have are simply technologies that would only analyze facial attributes and compare that of the video or photo with that of the document. Now, if you have made a fake document based on your made-up face, you would probably pass KYC.
How would they know that the user is using his/her real name? They wouldn't. For as long your fake documents bear your fake name, you're good to go.
Apologies for the off-topic, OP.