You can also say "I would like to know what is the creator kit", it sounds better, more friendly, and you will get the same answer

It's the toolkit to share your creations made inside of Unity for VAM.
Note: you should title your post with a generic title like "VAM 2 creator questions", and ask your questions in the post. I almost missed the questions in the title.
A way to encrypt and track information?
No.
- Since people share public domain, CC-0, CC-BY, etc... encryption is not possible. As you can't encrypt and prevent using assets to derivate or re-use ( encryption, DRM etc )
- Why would it track information for loose content? Meshed is very fond of preserving privacy for users AND creators, there is absolutely zero data tracked. The only thing you can identify in a package is the creator name, and you could put "OIHTEA92HF" in there if you wanted.
I really want to know what the benefit to creators are.
Without the creator kit you can't create assets for VAM 2. Hence the benefits are: being able to create assets.
Why does VAM not create its own models or at least it's own UV sets?
And if I do it the other way? Why would VAM not use existing and well know libraries?
There is zero benefit in creating custom models. It's the exact same final result, just with custom elements (topology, UVs, blendshapes...), which requires every single new element to be fully custom.
It requires more work for Meshed, for the VAM team, for VAM creators. It requires to learn the custom models, to have the sources, & so on.
Using existing and well know libraries gives you the ability to rely on standardized content. Have the gazillion of Daz tutorials already made by dozens if not hundreds of people on youtube. And have a set of ready made elements that helps people have a solid base to work with and derivate from it.
And final aspect, I'm gonna reframe this once more:
"VAM Team" is a couple of independent people working for a small portion of the content, but VAM itself is made
by one person: meshed. Making from scratch viable and clean custom 3D characters for VAM would be a huge amount of work. So it's a pragmatic choice, and a good one.