What is the most useless app that you have seen being given as a subscription?
For me, I tried a 'minimalist' launcher app for Android that had a 7 day trial or something and they had a yearly subscription based model for it. I was aghast. I would literally expect the app to blow my mind and do everything one can assume to go that way. In a world, where Nova Launcher (Yes, I know it has been acquired by Branch folks but it still is a sturdy one) or Niagara exist plus many alternatives including minimalist ones on F Droid, the dev must be releasing revolutionary stuff to factor in a subscription service.
Second, is a controversial choice, since it's free tier is quite good and people like it so much. But, Pocketcasts. I checked it's yearly price the other day, and boy, in my country, I can subscribe to Google Play Pass, YouTube Premium and Spotify and still have money left before I hit the ceiling what Pocketcasts is asking for paid upgrade.
Also, what are your views on one time purchase vs subscriptions? Personally, I find it much easier to purchase, if it's good enough even if it was piratable, something if it is a one time purchase rather than repetitive.
Then the dev needs to build out a range of protocols and API's to enable users to "supply their own server", which can bring a range of additional headaches, like having to provide support for external dependencies outside their control, etc.
What if the users "server" fails? Should the dev waste hours of their life assisting a user with a highly specific Google Drive issue when they spent $5, 3 years ago?
But the developer doesn’t need to provide support if you opt to use your own data storage and the storage itself fails.
Google would be the one to contact if Google drive has an issue.
Well yes, but that's not how your average user thinks and acts. They will either a) contact you as the developer of the app that doesn't seem to work and when your say it's not your fault give you bad reviews or b) directly give you bad reviews.
The average user doesn't work like that, also an average user does not always think he is average. There are many people thinking they are advanced, because they know where settings in Windows or Android are located. You will probably get bad reviews then emails, because quote "your app doesn't work". This comment is based on real experiences with Google Play Store and its users, thinking they know what they do.