Violation of section 3.1.2(a) of App store guidelines by this app – Star Walk：Find Stars & Planets Review

App store guideline: section 3.1.2(a) explains that current paid customers must retain all functionality of the app that they paid for. I bought this app and now have to pay for a subscription model?! How unfair!
Review by Hamzed on Star Walk：Find Stars & Planets.