Im not a js programmer but index.js has the line: "Signaling server running on http://localhost:${PORT}" -- is that what you're talking about? I think you're talking about the initial connection right?
util.js also contains "copyToClipboard = (value) => {", not sure why that would be needed.
and googletagmanager for tracking error/diagnostics I think? its hard to understand this code without learning the language lol.
Also in privacy.html: "To initiate a peer-to-peer connection, Berb uses a temporary signaling server to exchange network metadata (such as IP addresses, session descriptions, and ICE candidates)."