[tedshroyer]

I believe you are mistaken. It appears to inject a tracking token. https://docs.microsoft.com/en-us/azure/marketplace/azure-par...

[dewey]

It's not a user-specific tracking token, it's a tool specific token (https://github.com/terraform-providers/terraform-provider-az...)

All users of terraform will look the same, it's to get a general idea of "how many terraform using instances are there".