Well that didn't happen. But as soon as 2020 started Russian POS terminals stopped working. NY's parking meters stopped working. Even a game called "WWE 2K20" stopped working.
Reason is that people made a quick fix before 2000 that for two digit years, if the two digit year is <20 then it's 2000-2019. Otherwise it's still year 1900+. That way you can avoid changing database/form/report field size and still could have addressed the Y2K bug.
It's biting now.