Showing an example of notification on the "allow notifications" screen

Fishbrain displays an example of what a notification can look like in order to maximize the opt-in rate. The rationale behind this is that people will understand at a glance the value of notifications and are more prone to opt in.

Meditopia shows an example of notifications that they could send in the future if you allow notifications. This helps users make a decision based on whether they find it interesting or not.