That is, an AI that does all the same things - plays songs, mixes songs, appears in a livestream video (as an AI avatar or some kind of shape-shifting dynamically-generated video in the AI's case), and responds to comments in some way. (This logically implies that it must be interesting enough to receive comments.)

If it doesn't do all of these things, I won't consider it to be serious "competition". And it must be primarily focused on playing music - not e.g. talking about something while music plays in the background.

(Technically the AI doesn't have to choose the songs, the playlist could be chosen by a human DJ. We probably wouldn't know either way, and I don't consider it to be important. Or at the other extreme, the AI could even make up music on the fly.)

If TikTok ceases to exist before this happens, this marke will resolve as N/A.