> some way cross-apply the license purchase price to a subscription
They did do this. From the footnote to to their original announcement[1]
Recent purchases of the Mac app will unlock up to 12 months of free use, and purchases of the iOS app will unlock up to 6 months of free use. Your individual free-use duration is calculated from your actual purchase date, respectively, and if you bought Ulysses on both platforms, we will add together both periods.
They did do this. From the footnote to to their original announcement[1]
Recent purchases of the Mac app will unlock up to 12 months of free use, and purchases of the iOS app will unlock up to 6 months of free use. Your individual free-use duration is calculated from your actual purchase date, respectively, and if you bought Ulysses on both platforms, we will add together both periods.
[1] https://ulyssesapp.com/blog/2017/08/ulysses-switches-to-subs...