This website contains age-restricted materials including nudity and explicit depictions of sexual activity.
By entering, you affirm that you are at least 18 years of age or the age of majority in the jurisdiction you are accessing the website from and you consent to viewing sexually explicit content.
Did you read part two? The features are part of it (group chat functionality, media quality, etc) along with the seamlessness of it all. These users don’t want to download a separate app. They just want to text with the added features.
So users don’t care about exclusivity, they only care about features like less compressed video and renaming text groups which are exclusively available within an iPhone-exclusive app, exclusively when messaging other iPhones. Got it.