Simply solution have a 24 to 48 hour refund window
I'm sure this is the last thing Apple wants because they'll loose money, but if Apple really cared about the customer, they should make all sales pending a grace period (24 to 48 hours) where if you remove the app in that time frame, there is no charge.
If you install an app, remove it within the grace period then re-install it, you're immediately charged (like the store currently does)
It certainly would make scams like this less likely to happen.
I'm sure this is the last thing Apple wants because they'll loose money, but if Apple really cared about the customer, they should make all sales pending a grace period (24 to 48 hours) where if you remove the app in that time frame, there is no charge.
If you install an app, remove it within the grace period then re-install it, you're immediately charged (like the store currently does)
It certainly would make scams like this less likely to happen.