Ever heard "the wheel is yours"? I feel like that's what this is probably saying.
That said, this is a common complaint in Duolingo for years, and there are some crazy sentences, but sometimes they are fun and regardless they still serve the purpose of giving something to work with.
There are a lot of different approaches to learning a language, with various pros and cons. Personally, I find Duolingo's approach effective and being a free service I don't expect perfection.