Subscription fields on user account are not available to Views

I added 3 Mailchimp subscription fields on my user accounts (to subscribe to a different newsletters) and while they are available on the user edit page and work, they are not present in Views when trying to add fields or filters to a view showing Users.
I also thought of a relationship to add, but there is none regarding Mailchimp.

This is very unfortunate since Views is the module to use (and part of core in Drupal 8) if I want to list my subscribed users on an admin page on my site OR, even more important, I want to filter my registered users based on whether or not they are subscribed to my newsletters.. even to decide which have to be subscribed!

So, if this depends on some license permission Mailchimp is denying, tell them that we need to list or filter our accounts based on their subscription status to add them to their lists!

Let alone the fact that that the provided Rules or VBO actions don't work either (see this issue https://www.drupal.org/node/2410905), so we would have to select users, use "Modify Entity Values" (instead of "Mailchimp Newsletter Signup"), check the subscrition field, and save ALL the users of my site (wow, took 30 minutes with my auto-scaled Pantheon Business servers), and then, go manually to unsubscribe (by filtering each by his single email in the admin/people View) all those that unsubscribed themselves from my lists... WHAT? Are you kidding me?

(I even went on updating VBO to the dev version, but still doesn't work)