The fact they don't have a 'buy one of our magnets now, $10' button tells me that the tech doesn't actually work.

Farmers work with hundred kilo bags of the stuff.

yeah, but point is more like that we do not need hard to refine ( that is why are they called rare earths ) materials from china, if those magnets were strong as neodymium ones. which they are not in video.

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problem with chemistry is most of these things are easily made in garage.

For example Slovak military is training disposal of homemade explosives / chemicals by watching NurdRage videos ;)

https://youtu.be/Zybj-mi1FP0?si=KGMUJj5l5NUt2egh&t=68

or this simple technology from 1890 used in different way is helping helping Europe to be self sufficient with energy:

https://www.tue.nl/en/research/institutes/eindhoven-institut...

not that big a deal, but you do have to register and have basic security, ammonium nitrate is by todays standards just one step up from black powder, and if it's a proper company with mechanical and chemical engineers signing off then it's literaly just paper work.All in all industrial type experimenting involves avoiding exuberant exothermic reactions and dramatic kinetic events, with or without an electrical component, just about everyone involved has a story, and there are plenty of injuries and fatalities. One of the hard parts of bootstraping any industrial process is having people who have the knowledge and experience to train people in how to do things and not get hurt, it's not "saftey" as much as survival skills.