v2.0(beta) is live on google play. I'm implementing a new databank system where you can add your own subsets, so Don't worry if you can't access your articles, they're still there, just hidden.
Version 2.2(Beta) is on google play. The new databank is now nearly done, you can create and delete subsets and articles with the subset manager, I still have a few things to do however(Making sure all databank articles get transfered over to the new version)(Vertical stuff).
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The PDApp has a discord channel.
Most probably never. Apple charges 99$ a year for a developer account.