[bmarquez]

> So Apple will boot an app that gives users the ability to send adult content to other users....?

Yes they will, if they're on channels (which are considered public).

Not only are Whatsapp groups and Snapchat chats are considered private, those companies have much more clout (and lawyers) than Telegram. Facebook threatening to remove Instagram/Facebook/Whatsapp from iOS would hurt Apple more than Facebook.

Side note: Even lists with no adult content, but referring to adult activities get banned. The creator of an app listing Burning Man events had to remove all references to adult workshops or get the banhammer. Apple's walled garden, Apple's rules (sigh).