Wow, $49 forstatica noise app, we are all DOOOOOOOMED!
Hard pass! This app is the poster child for apps that should never see a subscription model. One time buy and IF you provide an update that I find value in I will upgrade, if not then I will stick with the version that I bought. There is zero day to day maintenence on an app like this.
Imagine being dumb enough to rent white noise.
Read the first paragraph. If you paid yearly you would have paid $40, and if you bought the new one time price you would pay $50. There will also likely be sales.
If you went monthly and then decided you wanted to stop you would have paid $3.
I don't like subscriptions either but this one isn't all bad. A few other apps from great developers have gone this way. The lifetime purchase seems expensive for phone software but some apps are worth it.
I do agree with what I think is your premise, that having to manage a bunch of subscriptions and remember to cancel ones you aren't using isn't great, and it is entirely possible someone would subscribe monthly and then just let it go without realizing how expensive it gets.