> No, it's not using TURN server now.

You state it uses PeerJS. And indeed, the code calls from PeerJS,

  const peer = new Peer();

(https://github.com/tonghohin/screen-sharing/blob/18f6ab93716...)

I.e., it constructs a PeerJS Peer without manually specifying PeerOptions. That class, in turn, states,

  /**
   * Configuration hash passed to RTCPeerConnection.
   * This hash contains any custom ICE/TURN server configuration.
   *
   * Defaults to {@apilink util.defaultConfig}
   */
  config?: any;

Since we're not overriding it, we take the default. And `defaultConfig` leads us to: https://github.com/peers/peerjs/blob/c073252f879b57757f8a82d... which lists STUN & TURN servers.

… so it sure looks to me like it is using a TURN server…

Sorry for the misleading wording, I was trying to say that I'm not paying for any TURN servers. You are totally right, PeerJS is still using TURN server under the hood. Thanks for pointing that out!