Proposal

Support WebRTC Data Channel in Workers (WebWorker, ServiceWorker, etc.)

WebRTC DataChannel is basically a drop-in replacement for WebSocket, except it's peer-to-peer. For all the same reasons that WebSocket was added to the Worker spec, we should add WebRTC DataChannel.

Use Cases

DataChannel in a ServiceWorker would support the use case of "peer assisted delivery" a la WebTorrent, CDN/P2P CDN video streaming delivery, file transfer, etc.

DataChannel in a WebWorker would support offloading CPU intensive data transfer/processing to another thread.

What about security?

Using WebRTC data channels in a worker is no different from a security/privacy perspective than using WebSocket. There's no user permission prompt to open a WebRTC data channel.