In reply to Alec Kinnear.

Hey Alec,

It's not my place to decide if a plugin is in violation or the repo guidelines or not. That is up to Otto and others and I feel that due process by the mods is in order before I start pointing fingers. I could be wrong from both the technical as well as interpretive angles. It's not my job really. If anything comes of it I'm sure you'll know. If the guidelines were more explicit or there were well document precedents of violations I'd feel more confident.

Postmatic falls into another category undermining real OSS and independent web publishing: serviceware. I.e. instead of just letting my server handle the hosting in a freestanding way, the site owner is obliged to sign up and share all user data with you and cannot just move the data back to his or her own hosting.

You're completely wrong here. Postmatic does not touch your user data, share it (even with us), retain it, or even think about it.
You are not obligated to do any of those things with us. And there is nothing to move back to your own host because it never went anywhere in the first place. If you are running Postmatic the only data of yours that flows through our servers is diagnostic log data of incoming comments and subscription confirmations which are retained for 30 days to help with support tickets. You can read about it in our privacy policy. In fact, i'm going to put the tldr; here:

You own your data, and your relationship with your users.
We’re just here to help.
We don’t profile your users, or interrupt them with advertising, or sell your data in any way. Fantastically-magical email-based commenting is our only product — not you, your users, or your data.

We choose to operate on an affordable, subscription-based revenue model with a generous free option. You and your users can feel free to post and comment on your site without the worry of being profiled, farmed and sold down the river. That’s not us, and we won’t have any part of it.

The only data that makes it to our servers is the data that we need to be able to reliably deliver emails for you (only true on Premium, actually), and even that is governed strictly by our privacy policy. Our commitment to openness and WordPress best practices keeps your data in your hands. Postmatic is built on the native WordPress comments and user systems to make sure that what’s yours, stays yours.

To be clear: we use native WordPress comments and users, which live in your local database and always will.