"Snap Inc., formerly Snapchat, Inc., is a camera company. The Company’s flagship product, Snapchat, is a camera application that helps people to communicate through short videos and images known as a Snap. The Company offers three ways for people to make Snaps: the Snapchat application, Publishers Tools that help its partners to create Publisher Stories, and Spectacles, its sunglasses that make Snaps. Snaps are viewed primarily through the Snapchat application, but can also be embedded on the Web or on television in certain circumstances. Snapchat opens directly into the Camera, helping in creating a Snap and sending it to friends. The Company’s advertising products include Snap Ads and Sponsored Creative Tools, such as Sponsored Lenses and Sponsored Geofilters. As of December 31, 2016, on an average, 158 million people used Snapchat every day to Snap with family, watch Stories from friends, see events from around the world, and explore curated content from publishers."
I currently have fb messenger, snapchat, groupme, and twitter on my phone. I mainly use the first 2. I've never used whatsapp or instagram at all.
OTOH, depending on how loosely or tightly you define what snapchat is ("ephemeral image communication platform", "image communication platform", "communication platform", "social media", "news aggregator"), there are huge groups of people that have never used snapchat or any competing products. There are lots of people in the US who have never used snapchat, instagram (stories), whatsapp, or even facebook messenger (the app specifically), which are the closest comparisons to snapchat. I think that's the point.