This is almost certainly not the case. Either they have KYC information, or they don't. It is possible their software is not properly written to request KYC for customers when their policy says it should.
Given how some services only ask for KYC if there's something they don't like, such as, but not limited to, IP address provenance, or blockchain activity, it wouldn't at all surprise me. Of course I'm still talking about transactions below a certain threshold.