Company gave me their real datasets for take-home exam + bait and switch

I applied for a DS position at a company a while ago and interviewed with them, after which they gave me a take-home exam. It was a project where I had to use company data, and I completed it within the given one-week deadline. However, it's been almost a month now, and I haven't heard anything back from them. I suppose I'm not hearing back from them ever, but I want to know if this was legal for them to …

data datascience datasets exam hearing home legal machine machine learning project