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
people can easily shatter padlock shackles with ramsets, which are basically little blank round gunpowder powered hammers. not sure if a gun would, but sure seems like it.
also, the asteroid one is probably quite true, but saturns ring are between 10m and 1 km in thickness, so there are exceptions.