Anyone have thoughts or testimonials on use of biochar?

Easy to make with a brush pile lit from the top and put out with a hose. I often wonder about all of them apparatuses knowing full well that the ancient origin of this is lighting and wildfires giving indigenous peoples worldwide that knowledge of slash and burn. It’s pretty simple even though it can be complicated. I’ve also noted eBay is pushing a sellers Bamboo Inoculated Biochar from China. Thought I had seen it all - smh

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