Was software piracy behind the San Francisco Muni transit system ransomware infection?

People using San Francisco’s Muni public transportation, which consists of buses, streetcars, Metro light rail and cable cars, rode for free over the holiday weekend. It’s not like SFMTA bothered to send even a tweet to inform confused Muni riders as to what was happening. Some of those people thought the free rides were part of a Thanksgiving gift or “Black Friday deal,” but anyone who happened to glance at San Francisco Muni station computer screens knew better. On Friday and Saturday, the screens all displayed:

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