Yeah, the overall conclusion is that smartphone contact tracing probably isn't working, but we can't know for sure because the megacorps who designed it did so

Yeah, the overall conclusion is that smartphone contact tracing probably isn't working, but we can't know for sure because the megacorps who designed it did so in such a way that makes it almost impossible to measure if it's actually working. The only app we know has definitely been ineffective is Australia's centralized solution, in large part because they do actually have the ability to collect statistics on its effectiveness. We do also know that Germany's app was just outright failing to send alerts to users of many common, popular devices due to limitations on background tasks: https://www.dw.com/en/germanys-coronavirus-tracing-app-criticized-over-warning-failures/a-54305099 https://www.dw.com/en/germanys-coronavirus-tracing-app-criti... Obviously there's no way to know exactly how many people should've been sent a warning and weren't either, by design.