Apple on the other hand unfortunately has nothing like that. If you want refund, You have to go through the hassle of creating a ticket and they may refuse to refund for whatever reason.
But still I think it's a mistake because 15 mins is not enough time to know if the app is going to work. Sometimes it takes that long just to get the damn thing installed! Especially if on a mobile connection or the app is big. I once got screwed because I bought an app that didn't work on my device, but I couldn't find out within 15 minutes because my storage was too full and the Play store refused to install it until I cleared out more room. It took a while to go through all my stuff and back them up to the cloud, so by the time I actually got the app installed and found out it didn't work, it had been 20 minutes or so. Now I'm very hesitant.
A 1 day return period should be enough. Once you return the product you cannot trial it again without purchase.
If there’s gonna be a short timer it should start the moment the app is first opened instead of the purchase time.
As an example, I recently tried a sleep tracking app. It is a subscription service but has a 1 week free trial. I tried it for a few nights, hated the mechanics of making it work, so I canceled the free trial and uninstalled the app. $0 spent on a paid app, completely supported by Apple.
It should be something available by default, but the workarounds seem pretty widespread. The advantage of this approach is that many developers offer "pay per month" or "pay a lot once" for their paid apps. The user can choose which one they like better.