TikTok Software Developer interview questions

I just passed the first hr call, and my first tech interview is coming in next weeks, the hr call process is good and the recruiter is responsive, during the first call they asked some typical question like why tiktok and let me talk deep to my project

applied online, receiving online assignment, and no more stuff afterwards, do not know what happened just want to move on to next job and do not disappointed to myself, why do i have to write 30 words when there is no content worth of 30 words lol