It was really a problem for older systems: banks, perhaps your power company, government agencies, or really any other system that was set up from the 1960s to, say, the late 1980s. Anything built after that would have had Y2K already accounted for.
So the worst possible scenario? Bank systems fail and you can’t perform transactions until they figure something out. Government agencies might not be able to process requests that depend on old systems. Some people might lose power.
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