When we joined PlayFab, it was because PlayFab seemed more trustworthy, claimed cheaper rates than GameSparks, and had that indie feeling to it with growing features - at that time.
However, since I used PlayFab about a year ago, many things have happened, including growing limitations (that were not transparent until recently, but I accepted them), slowing down of features (including, still, the inability to do something common like delete stats instead of asking us to make a new title every time, rendering other modules useless such as leaderboards and prize boards), but I still stayed...
Then, when the time had come to upgrade my account out of the free tier, $299/mo MINIMUM appeared on my contract offered before this was changed on the website, with no indication in fine print or any other place that there was a $299/mo minimum (cached site), only to unexpectedly find out by a single line subtly printed in the middle of the contract. Despite pointing out the lack of transparency (with a dev response bravely admitting it, which was pretty cool at least), we were still not even offered the amount advertised. I'm not going to say the term for this, but you know what this is called.
Such practices have not only caused us to lose PlayFab's integrity and trust, but have also cost us 150+ hours of development time to port to GameSparks (free/no limitations as an indie dev).
I'm not salty because the new system has no limitations and spoils indie devs (+includes realtime services), but I do want to point out that what PlayFab did was wrong. I am happy to see that you have included the $299/mo min. on the site, but many devs (not just myself) have been implementing PlayFab for a long time now with $8/mo in mind:
That said, I really hope that you email your list with such an important update so they don't fall into the same situation as we have. That is my only hope.
This thread will probably be filtered out, but I hope PlayFab will do the right thing and do what they did not do before: Inform their users with transparency.