It wasn't an attempt to prevent any warrant at all. It was an attempt to prevent the authorities from accessing data NOT COVERED BY A WARRANT. Once Uber's law

It wasn't an attempt to prevent any warrant at all. It was an attempt to prevent the authorities from accessing data NOT COVERED BY A WARRANT. Once Uber's lawyers have reviewed the warrant they will instruct the sysadmins to provide the covered data in a clean way which doesn't expose extra data. Simple as that. Generally speaking warrants are not granted for "all of your data." Imagine if every time the authorities got a warrant for some data Google has about a particular suspect, Google would reveal all of its internal data about every user, all of Google's internal financial files, etc. That would be insane.