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WebRTC datagrams are very 'close to the wire'. Size them correctly, and they map 1:1 with UDP packets.

I can't think of many network applications you couldn't build on top of them.

The problem with WebRTC is software support. It's not an underlying technical issue with the protocol itself.

You can do the same with QUIC streams (size them appropriately and get a 1:1 mapping with UDP packets).