So I went looking for an app and I must have reviewed close to 50, every single one had a "subscription". Now I get it, apps aren't easy to make and aren't free either, I get paying $2, $3, hell $5 or $10 for the app, but don't make me pay you $2.50 per month for all eternity.
Now I get subscriptions, I happily pay for Netflix, Spotify, and even some lesser known apps that have a subscription. But in every case those apps are providing me with a great value, 1Password is another great example. But to charge for a subscription to just use an offline app? No.