A judge would review the warrant before issuing it hopefully. I think Google can basically say "Look, this is a bad warrant and you'd be better off narrowing it

A judge would review the warrant before issuing it hopefully. I think Google can basically say "Look, this is a bad warrant and you'd be better off narrowing it a bit" and that would work in most cases. You, as a defendant, can also challenge the warrant as part of your trial if you are caught, potentially getting the results of the search thrown out.