Freelancer itself is already asking for data/KYC from users, why the client is asking for KYC is really suspicious. It's a good thing shasan saw it coming. Hack of troubles they plan just to get documents to be used for verification.
This is simple, as Sujonali already wrote.
His client is a gambler of Wolf.bet casino. The casino asked him for a KYC.
But, he cannot do the KYC because either he violated some rules or he may be from a banned country.
Instead of submitting his own identity. He wants to raise someone else's Docs to verify his wolf.bet casino account.
Thanks, shasan. Please stay away from them.