Couple of quick notes...
Thank you, I made some changes:
- Changed that it only runs on 32-bit PPC to running on legacy PPC (because of course the G5 is quite old an MorphOS doesn't support IBM Power8/9/10 systems)
- mentioned AmigaOS compatibility
- mentioned 2-finger taps
- Smaller changes to wording
On the license I think unless the whole product is open source, it basically doesn't count. E.g. the base of macOS and iOS, Darwin, is open source but all the higher layers of code are not.