Sure, Apple is sometimes a beta customer of new features in Brand Registry. But in general is not the only company that gets this treatment from Amazon and Apple’s competitors can sign up and use almost all the same services through Brand Registry.
Source: Its been a few years but I built many of these counterfeit detecting systems from greenfield.
The biggest problem really has been brands not wanting to engage with Amazon or Brands not being anywhere close to organized enough to help. In many cases simple questions like “Please give us a CSV of all your products. We will not add them to Amazon’s catalog” was met with “we don’t have such a CSV or database”, “ok we pulled together many products into a CSV by searching years of emails and Dropbox files but if you want the products from our European and Asian divisions please message them separately”.
I can tell you, Apple does not have these same organizational issues. They know every product they have ever made, they are happy to share, and they are happy to leverage experimental features.