"To demonstrate how crappy most front door locks are, to boost our company's social media cred we will be leaving drills and a dish of bump keys at the entrance of the neighborhood."
NTLMv1 rainbow tables have been available for 15-20 years. The only thing new is that Google are publishing theirs.
you say that like it's a negative analogy
The bad guys already know you live in a bad neighborhood and have been closing your front door with a plastic combination lock you got in a Happy Meal 40 years ago. They can already come and go at a whim. This is Google letting you know that your crappy lock is pre-broken to encourage you to upgrade to literally anything else.