I’m being both. On one hand with so many people saying they thought it was just 3D (as opposed to vector) I thought I’d make a ripple… on the other hand it does actually look like those vector graphics. It’s easy to assume “just use toon shader” etc etc, but in reality these simple looking effects often have a lot more to them than meets the eye.
For this reason, a step by step setup showing your thinking and workflow (the “why” of each step) to achieve the goal you wanted could be useful… much more useful than just the end result material & lighting settings. If you did it well enough, the tutorial could be a good contribution to the BlenderArt magazine.
P.S. You can make a bit of dosh the other way around. There are vector studios who pay for vector artwork clipart etc… and artists specialising in quality of this media are relatively few. By converting Blender renders into SVG you have a real head start on it looking at least half decent.