> Push notifications can be considered a form of recommender system
No. Push notifications are notifications. They have to notify you about something that has happened that concerns you, personally. Like if someone sent you a message, or commented on your post, or liked your content. A sale in a store, or an app update being available, or it being a certain time of day, does not, ever, under any circumstances, qualify as a reason to send a push notification. No matter how cringe-cutesy it is and how many emojis it contains.
Bulk push notifications in any shape or form Just. Should. Not. Be. A. Thing. Period.
No. Push notifications are notifications. They have to notify you about something that has happened that concerns you, personally. Like if someone sent you a message, or commented on your post, or liked your content. A sale in a store, or an app update being available, or it being a certain time of day, does not, ever, under any circumstances, qualify as a reason to send a push notification. No matter how cringe-cutesy it is and how many emojis it contains.
Bulk push notifications in any shape or form Just. Should. Not. Be. A. Thing. Period.