Exclusive Concepts interview questions

I had an initial phone screening that went well. All typical first screening questions about my resume. The second interview was with the hiring managers. They asked more in depth questions about my experience. I was then asked to complete an assessment of my skills for SEO strategy. This is where I feel this went wrong. They requested an assignment that took me a full Sunday to complete. I had to do a Quarterly Strategy for one of their clients and complete a presentation for it. I personally felt that this was free work but went ahead with the assignment with hopes that I would get the position. This is not the first company I have experienced that expects free work. I have skill badges on Linkedin and Indeed that lets companies know that I have proficient skillsets in SEO. I did not hear back from them after the presentation I did and I had to follow up. After my follow up I was told I did not get the position without any explanation on how I could improve etc. Of course they wanted the file I completed so they got all the ideas I created. I found this very frustrating but it also let me know that I would not be interested in a company that does not respect a candidates time.