Gradus Group interview questions

They sent me a questionnaire at first, which to me is always a weird red flag that usually scammers do. After answering the questions, they gave me one of their product pages to redo as a take home project. I made a very in depth product page with prototype, but came to Glassdoor to make sure my ideas wouldnt just end up stolen and became discouraged. I asked the "interviewer" some reassurances when inquiring about the allegations, and she never responded to me after many messages that were responded to within the business day.