> there is inherently no such thing as a vulnerability that can be exploited at scale. There are, many. In the past 30 years, most European countries have gone

> there is inherently no such thing as a vulnerability that can be exploited at scale. There are, many. In the past 30 years, most European countries have gone through at least one monetary reform that made previously issued banknotes obsolete. The first wave was USSR's and its satellites' collapse in 1990s (with very unfavorable exchange rates to new currencies), and the second wave was the adoption of Euro in 2000s and 2010s. Germany's central bank converts the obsolete Deutsche Mark to Euro to this day, France stopped supporting the French franc in 2012. Full list: https://www.ecb.europa.eu/euro/exchange/html/index.en.html https://www.ecb.europa.eu/euro/exchange/html/index.en.html So if your elderly relatives overreacted and hid a stash of francs on the day planes hit WTC towers, and you discover it now, the money is worthless.