My take on this whole thing is I just really feel it is up to the individual if they wish to enable the pedigree link or not. Expecting secondary market owners to enforce their renters to use the pedigree link isn't realistic. It also isn't the secondary market owners' responsibility to make sure their tenants are using the pedigree link.
I do enable the pedigree link, but not everyone knows how to do it. I have spoken to a few who didn't even know it existed.
I have bought several kittycats without a pedigree link available to me. If they are a cute kittycat that I've been searching for and they are being kept as a pet, the pedigree doesn't matter.
I'm pretty laid back when it comes to things like this. Just my take on it.