Is this replacing the one-time purchase of these apps on macOS?
No, fta:
> Alternatively, users can also choose to purchase the Mac versions of Final Cut Pro, Pixelmator Pro, Logic Pro, Motion, Compressor, and MainStage individually as a one-time purchase on the Mac App Store.
Doesn't sound like it > Alternatively, users can also choose to purchase the Mac versions of Final Cut Pro, Pixelmator Pro, Logic Pro, Motion, Compressor, and MainStage individually as a one-time purchase on the Mac App Store.5