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The whole point of the warrant was that the government suspected Uber of hiding evidence. Allowing them to pick and choose the data they unlocked from the servers would be counter-productive.

In Canada, like in the US, warrants have to be specific about what exactly the police are looking for. If the warrant really was "give us all your data so we can see if you're hiding something", that's not legally okay, and I can't blame them for trying to prevent the disclosure.

It seems unlikely that logging out doesn't destroy the data stored on that system. Of course, the data still exists somewhere, but that particular raid is likely thwarted. If it were any company other than Uber I'd say this would surprise me. Usually companies rely on a auto logoff timer, but this is an active method in response to a raid. It looks awfully like obstruction of justice to me. The digital equivalent of flushing your weed down the toilet.

When the police show up to my door with a search warrant, I tell them to wait outside while I gather the items they ask for. Oh look, no evidence of crimes.