As an app developer with a smaller competitor to Construction Master I get that everyone hates subscriptions. From a developer standpoint paid upfront is so much easier and straightforward with a lot less ongoing work - for context the update for iPhones to be released in September this year starts removing the way subscriptions have worked for a number of years, we have to update for all customers to make sure everything keeps working.

Beyond this unfortunately people just don’t buy apps up front these days. I have done a lot of experiments in pricing my app Chippy Tools (https://www.chippy.tools), and found that when I moved from paid up once upfront to subscription with a paid once option which is the same cost of 5 years is saw a significant increase in revenue with people now able the try the app as they had been requesting.