What function does Instagram provide with this WebRTC listener besides tracking?

People install Instagram to look at photos and reels, not to help facebook track them better.

If I put a crypto-mining script in a game I don't get to claim "well they installed the app" when people complain. The victims thought they were installing a game, not a crypto-miner.

Here, the victims thought they were installing a photo sharing application, not a tracking relay.