Everything started okay, they quickly sent the assignment. But, what people are saying here is true, it feels like they use you for free keyword ideas. You do the work and then get rejected. Keep in mind that I applied for an intern position, with 2 years of experience with a much broader knowledge than expected for an intern role and I got a generative reject email. And the assignment did take some time so I was not happy, to be honest. Don't waste your time...