TikTok Content Strategist interview questions

I attended 1 call with the recruiter, then 3 video interviews with staff in China and London. I also delivered a 20 page work assignment at their request. So it was very frustrating and hurtful to then be 'ghosted' by the recruiter and her team. No verdict. No response to my emails requesting an update. Nothing. When candidates spend this much time and effort, an automated notification that you haven't got the job is surely a minimum professional courtesy.