Why do people call the chat on tiktok live "the comments" and not "the chat".

I have a qweshton, on just about every tiktok live i watch, the creator refers to the live chat as "the comments", and I don't understand why, on twitch and youtube "the comments" is either a completely separate offline section. I see creators off tiktok refer to the live chat as just "the chat"..never "the comments". So what makes the live chat become "the comments" once you're on tiktok?