Freenet implements low latency queue and allows for near-realtime communication over distributed storage. Specifically, “IRC over Freenet” WAS made long time ago. You get modem-like delays and bandwidth, but is this a problem? Trying to use it when someone is actively searching for you is a different story, because there's a balance between sending data and being detectable.

TIL, my mistake. Thank you!

Not wanting to attack here, just wanting to add more info:

IRC over Freenet is actually in use today: It is called FLIP and has 1 minute round trip times. Which is shorter than what people typically notice (except if they actively measure it), because most take longer to type their answers than FLIP needs to deliver it.

You're mostly right. There is FLIP (basically irc for Freenet) but as you can imagine it's very slow. No such thing as instant messaging on Freenet. You can theoretically stream live video at low resolution (with a large delay) but it's not really designed for dynamic content.