Subscription for what? – Buddy: Budget Planner App Review

I love this app. The premium features are subscription based. Usually, if it is a subscription based app, then there needs to be some service provided. Apart from syncing the expenses, I do not see any services being provided which warrants subscription based model. Also, if it is being synced to my iCloud for which I already pay, there is no need to pay again for it in the app. I wish there was a way to pay to upgrade to a pro version. I really do want to support the developer but subscription doesn’t make sense to me. Please do help me understand.
Review by shravanSP on Buddy: Budget Planner App.