On the heels of a drive to kick out "copycat apps" that rely on name confusing and similar graphics to get sales intended for original apps, Apple is also warning developers to avoid using third-party marketing services that are known to employ "bots" to automatically download free apps that rely on in-app purchasing for monetization to push up rankings, AppleInsider reports. Simply hiring a third-party marketer that uses such tactics can get the developer banned, Apple says.