Its killed several hardware projects (Nexus Q comes to mind immediately, though that only got into anyone's hands as a prerelease version at I/O 2012), but I don't know that any of those have involved bricking devices already sold (though cutting off software support and associated services may have reduced the potential lifespan for some, but that happens for old models from most makers even if the project isn't killed; Nexus Q, for instance, had support dropped in Google Play Music and Google Movies & TV in May and June of 2013.)