UnDraw has become hugely popular within the design community. If you are able to recognize the style then you will start seeing the illustrations all over the internet. Thumbs up to the makers.
And very good. UnDraw is my personal favourite of these kinds of illustrations, the shapes are just right. As opposed to Humaaans, which I hate with passion and could write a whole philosophical essay on it (it seems to be going for making body parts sized inversely proportional to their importance to the brain, which I find uncanny).