[delinka]

Has anyone even publicly discussed how to mitigate metadata collection? I don't recall any such discussion, but this also isn't really my area of interest.

I'd imagine a system that's completely a p2p mesh network. "Oh, hello, peer. I have 17 blocks for delivery on the network." Those 17 blocks might be pieces of messages for said peer; they might be destined for other nodes anywhere in the network; maybe they're noise. And don't forget to hand those blocks off to other nodes as well, because maliciously dumping blocks could be a thing...

[a1a]

Not really my topic either but I guess messaging via TOR or alike is the best solution.

[delinka]

Perhaps, but then I believe each participant in the messaging system would need to run a hidden service to receive messages. I think you may be onto something here.