Yes, Lumafield does some of my favorite marketing ever. It adds more (absolute) value to the world than they receive back from it. Their monthly CT scans are some of my favorite small joys: https://www.scanofthemonth.com/
I mean, there's probably very good ROI on this marketing; I'm not saying they're foolish or selfless. Just that it doesn't cost them that much to do, so it's a win-win for everyone.
Interestingly, I ended up buying a Blendtec blender many years later when I could afford one because of those YouTube videos. They long-since stopped making them when I finally got one.
Lithium is an (albeit soft) solid at room temp. Im not sure there is risk of it becoming powder in a blender but adding water during the blending process (or at any point) would be the main concern for me.
I mean, there's probably very good ROI on this marketing; I'm not saying they're foolish or selfless. Just that it doesn't cost them that much to do, so it's a win-win for everyone.