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Welding rebar is almost never used in North American building construction, and is actually forbidden in high seismic zones.

But then again so is stainless steel rebar and carbon fibre rebar and most of these other types of products because they lack ductility

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This is kind of what I was thinking while reading comments here.

I'm sure stainless rebar is easy to make. We could turn out huge amounts of it. But I don't see it ever having the same useful properties. All manner of stainless I've worked with is incredibly stiff and hard compared to regular steel. It's actually desirable in most applications, but rebar in particular needs to be flexible.

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