Some of the functionality requires subscription now. Stuff that were free for years, are not free anymore. Plus you get a learn more button on the interface, taking you to the a subscription selection screen. My humble advice to the developers. If you realize that your little free app is surprisingly successful and start to regret that it's free, then you sit down, figure out what ADDITIONAL functionality could make your users pay for the app, then put in the work and then ask for their money. Making a big part of a free app's functionality subscription based is not elegant to say the least.