It wasn’t that computers would crash. Its that they might treat midnight Jan 1 as a hundred years before almist-midnight Dec 31, instead of one minute later.

Really critical things like airplanes would probably be OK, but your savings account would suddenly be drained thanks to 100 years of negative interest, while your credit card would sudddy go from owing $1000 to having $60,000 in available credit.

Y2K, if no one had done anything, might have ended capitalism. Assong that there were no nuclear launch systems with a date-based “don’t shoot” dead-king switch.