In the past few months, governments ranging from Australia to the United Kingdom and corporations as influential as Google and Apple have pushed the idea that cellphone tracking can be used to effectively fight COVID-19. There was even an essay here at Quillette, arguing that a mandatory phone tracking app would save lives while also saving jobs as a policy alternative to economic lockdown. Unfortunately, the idea that phone apps should be popularized or even mandated to fight outbreaks is techno-utopian, based on optimism rather than evidence. The real impact of such an approach on society wouldn’t be better immunity, but rather the acceptance and creeping growth of an even more powerful and omniscient global surveillance state.