I also use AntennaPod on Android and sync it to my self-hosted Nextcloud instance using GPodder Sync, where I can access my podcast subscriptions and episodes using NextPod.

They didn’t even post about this decision! What a shame!

I suggest voting on the following Proton’s UserVoice idea I have just created. This may be the only way of getting their attention.

https://protonmail.uservoice.com/forums/945460-general-ideas/suggestions/49586459-reactivate-proton-s-mastodon-account