-snip-
i see what you mean, and i realize you're not saying this is a bad or a good thing but simply stating it like it's a fact (and also implying you dislike it), but doesn't it seem like it would be this way for most artists?
your example is of one artist, powerdag (feel free to use his name some time), and his preferred style is drawing cute, chubby, furry characters, so yeah; they pretty naturally look similar since he has one strongest preference and one specific drawing style for the fur, the chubbiness, etc.
idk, i feel like you could apply this to pretty much every artist, though in many cases probably not the silhouette example.