The next couple of versions will focus in getting reed of any existing issue, then I will resume working on this feature.
I may have found a solution to handle the charge necessary and which might not cost too much.
Once a first beta with basic subscription syncing is available I will study the impact on the servers (and the cost), then I will add more syncing step by step, in order to sync the read status, favorite flag, playback progress, …
Hopefully I’ll be able to add this feature in the free versionMollee Erickson commented
I was able to migrate all my data using these steps: https://podcastaddict.uservoice.com/knowledgebase/articles/292734-how-to-switch-between-devices-or-flash-rom-without
you have to search a little for the actual file, but by saving it to Google Drives and downloading it on the new phone, it totally worked!