ByteDance Content Strategist interview questions

I got an email from a recruiter based in London for a 30mn chat, then same with the manager, then with his manager based in Shanghai. Finally I had to do a PowerPoint. And then no answer, nothing. I had to ask them for feedback, the recruiter wasn’t working there anymore, got an automatic reply. Bytedance and TikTok are part of these companies that ask to do a presentation on an idea or a strategy just for their personal intelligence. Free work! It’s a shame