What makes this different from the other publisher-based tools already on the market / available?
Jeff Bezos isn't actively profiting from the surveillance of (potentially un-)published articles with their tools? But in all seriousness, after everything that Amazon has done with respect to enabling and profiting from surveillance, and the lengths to which they will go to imaginatively cooperate with the police, I can't imagine why any publisher of potentially sensitive work - i.e., journalism - would want to use a platform built by a company owned by the same person to store any information of material value before publishing. And even for publicly published works, storing it here might be setting it in a data format that is more amenable for computational investigation.