I believe you were fairly accurate in your assessment, Tofflemire. 
These policies focus primarily on the organizations and to those advertising.
I don’t believe this question was specifically answered, but it does seem the answer is contained in Kaivax’s post.
Specifically - “inviting players from another realm to join them in traditional game activities in exchange for gold are allowed, as they were before”.
Indeed. Unsupported, and obviously comes with its own risk, but not prohibited.
Using any kind of third party service to move funds, that’s what you would want to avoid.