Coronavirus contact tracing apps were tech's chance to step up. They haven't.

""It is something that launched and then sort of fell away," said Ryan Calo, a University of Washington law professor and expert in tech policy and privacy who was an early skeptic that the apps could be effective. He said it makes sense for states to focus on human contact tracers, who "have been effective since the bubonic plague."

"If Trump comes along and says, 'What have you done?' they can say, 'Well, we provided this API, and we can't help it if the states aren't using it.' So they've sort of discharged their obligation," Calo said."