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.
Might be a slightly unpopular opinion, but Volumio (software for a raspberry pi to run it as a headless audio system). It's good, it's relatively well maintained and works. But paying 7,50 a month for this software to get multiroom audio, Tidal integration and some other stuff is ridiculously expensive. That's nearly 90 euro a year and the only thing that is actually an addition server side is syncing settings across devices and the Tidal integration (requires license fees iirc).
And sure, I can't buy multiroom speakers for that kind of money, but damn, is it expensive.
I tried Volumio recently, and was prepared to maybe get the paid version if it was as great as it seemed. But the user interface was so god-awful! Absolutely unusable for me. Would never pay for it.
Instead I googled a bit and found Moode - a million times better, and free. Don't remember if it does multiroom audio, but personally I don't need that currently.