Gradle Technologies Software Engineer interview questions

I did not pass their home assessment, which they say takes ~10h. In reality it takes > 20-30h. If you have nothing to do and love wasting time in forsaken frameworks, go ahead. No adequate documentation, examples. Just pure reactive code. It is all in 10h, remember. Create a UI, face ambiguity in requirements. During the assessment I had a feeling, they want me to buy a book about that framework. They will not give feedback. I think it is complete disrespect of a candidate and just waste of time.