Why you’ll notice your subscriber count dropping?Last Updated: June 20, 2018
The number of active subscribers may drop. Some of the reasons behind this drop are –
User Blocked You – If they find that your notifications are annoying or too frequent, they may revoke the push notification permission on their web browser.
They re-installed or changed their web browser – Push notification permissions are granted for a particular web browser from which they click the “Allow Notifications” button. If the user uninstalls this browser, the subscriber will no longer be able to receive push notifications.