A new startup proposes using corrosion-resistant steel in bridge construction for 100-year lifespans. However, Hacker News commenters point out the challenges. One user notes that stainless steel rebar, like galvanized or epoxy-coated rebar, is already uncommon due to its higher cost compared to carbon steel, a significant factor in public infrastructure projects financed by bonds with 30-40 year terms. Another critic highlights that anti-rust coatings on rebar are not new and the article should compare the new tech's advantages honestly. They also raise concerns about the difficulty and potential hazards of welding stainless steel rebar compared to traditional rebar. In essence, the proposed innovation faces hurdles related to cost-effectiveness and practical implementation in the construction industry.