I had one a little while ago where I spent a fair amount of time on the request, and I thought was pretty well done. It completed all their tasks, showed how to use their api, and it showed I know how to integrate several different technologies, from front things like React to building an API to interact with theirs and setting up and configuring cloud technologies. They came back, and said, "We don't want to continue, we expected more from him." I sat there baffled and so did the recruiter, as it clearly did everything and more than they asked for in the assignment.

I am so glad they didn't want to go further as I am sure they are a nightmare to work for.