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Why is Google allowed to remove purchases from our Play Store accounts without telling us?
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
Technically won’t be able to download from the app store but using applications like imazing to download it and as long as you previously owned it, Apple will restore your purchases.
I’ve been using a manga reader that got taken off the store around 2017, still use it and transfer it to each new device (works for both phone and iPad). The ad-free in-app purchase restores just fine too.