Same here. I hate subscription too (I only pay for iCloud +).
But, it makes sense for some situations, just like Blocs for iPad. For Blocs Master content, annual membership makes it much cheaper for users to get started, and you can always cancel it if it is not right for you (while keeping everything you downloaded and use it for life).
P.S. Very excited to release the new Blocs for iPad Course for Blocs Master members very soon! 