I agree that the innovations are not major, but each little nuanced feature in combination makes it so that people share the little moments in life and you suddenly have a small window into the daily lives of your close circle.
EDIT: I should mention that I have no opinions on its viability as a business. Just commenting why I enjoy using it.
This doesn't really agree with
> The problem is that this killer feature is easily subverted
Let's let one company implement the feature before we decide it will be easy for competitors to implement it too.
The feature is fundamentally impossible in exactly the same way as DRM, because it is DRM. You're sending someone a bunch of data and saying "now, you promise not to look at this, right? Except once."
Snapchat takes two approaches (that I know of): First, they don't stop it, but the messager is supposed to be notified when it happens. They know this doesn't work and can't work, though; avoiding screenshot detection isn't even considered a reportable bug. (see https://hackerone.com/snapchat )
Second, they have a legal barrier, in that using a third-party client to communicate over Snapchat violates their terms of service.
Notably, neither of those makes the messages any more ephemeral. This makes sense, because stopping people from recording messages that you send them is not an achievable goal. Barring some sort of supernatural influence, it's no more achievable for Instagram than it is for Snapchat.
More to the point, this "killer feature" is easily cloned by a competitor
... which is why I was skeptical of Groupon's value from the outset.(And every time I mention that about Uber on HN, people point out that they can get Uber in any city in the world, so why would anyone who never travels use anything else?)
Snap had first mover advantage, which is nothing to scoff at.
Quicken Loans came out with a service called "Rocket Mortgage" several years ago and I thought, "who wants to enter the likely largest financial commitment of their lives at the click of a button?" Turns out, lots of people... simplicity sells.
Anyways I think eventially once one of these big data hording companies goes under to the point of simply selling all their user data to the public in form of a paid search engine, and public/private key encryption is super simple and mainstream, things will change. I'd bet it might just be when Snapchat goes under;-)
Every messaging app is essentially like one long email thread, whereas Snapchat provides real freedom to be spurious and in the moment without future embarrassment.
And anyone can secretly record anyone at any time in any interaction. That doesn't stop people from communicating freely.