Many of us are afraid that our personal data could leak through these mandatory KYC platforms and be misused for illegal activities later. That's why most of us either avoid KYC based sites or limit the platforms we share our documents with. As for me, I don't hand over my KYC data to just any sites without verifying it's credibility first, I try to dig as much as possible and I have only done it a few times only. This is another topic that tells a real life story of a person where his personal info were stolen, you might be interested to read it.