Malicious actors will certainly take advantage of this as well.
I also don't think it's ersatz anything. It's what you use if you build large, stiff objects that aren't supposed to rust. It's certainly less ersatz than steel, with a less martial character.
So I don't agree. I think it can signify something clean, light, unburdened by heavy and unnecessary things. I don't intend to use it though, for reasons everybody else gives, app-stores etc.
“Aluminium was difficult to refine and thus uncommon in actual use. Soon after its discovery, the price of aluminium exceeded that of gold. It was reduced only after the initiation of the first industrial production by French chemist Henri Étienne Sainte-Claire Deville in 1856.”