for 3d printed gun people (not personally one of them, just browsed their subreddit once), they use some vaguely blockchain crypto related p2p video host called LBRY, not sure if that model is scalable though, as it seems to be based around free p2p hosting like torrents, although there was some mention of hosting fees, presumably in crypto? not sure
It sounds like a lot of the precursors are too generally used to blanket ban them because of fentanyl. Kinda seems like this is just the cost of seamless worldwide shipping, we simply can’t open every bag of cat food being shipped to make sure its not a fentanyl precursor.