My rant on Twitter, after receiving a push notification asking me to download an emoji keyboard:

.@AustralianOpen Stop spamming. Read rule 5.6: https://developer.apple.com/app-store/review/guidelines/ … pic.twitter.com/ppa7pOhnuy

Rule 5.6:

“Apps cannot use Push Notifications to send advertising, promotions, or direct marketing of any kind”

App Store Review Guidelines

I wish Apple would enforce this rule.