Also, oddly, this post highlights “no subscription” about their project but the App Store page shows several subscriptions and that the app actually costs $40 a year?
This is likely one of the many pains of App Store subscription configuration issues. Once anyone has subscribed you will have to migrate those yourself and even those details I'm not sure what restrictions there are. The latest seems to be one-time purchase, but historical cleanup is probably necessary on their part
on pricing, that is fair callout, older versions had subscription and App Store listing might still show that depending on update or region
I recently moved it to one time purchase because it makes more sense for this kind of tool
https://flyingmeat.com/retrobatch/
Also, oddly, this post highlights “no subscription” about their project but the App Store page shows several subscriptions and that the app actually costs $40 a year?