You're describing the market for low end commodified illustration. e.g.: cheapest bidder contracts on Upwork or similar 'gig work' services.

In practice in illustration (as in all arts) there are a variety of markets where different levels of talent, originality, reputation and creative engagement with the brief are more relevant. For editorial illustration, it's certainly not a case of 'find me someone who can draw X', and probably hasn't been since printing presses got good enough to print photographs.