Whether it was unethical depends on whether anyone suffered negative consequences and whether Google knew, or could foresee that. For all we know the bandwidth was available, couldn't be sold to anyone else for lack of customers and would simply have gone unutilized if Google hadn't used it.
Why would that be funny? A lot of ethics is about not destroying someone else's value. Value is measured in money.
Take healthcare. You would not put a price on your own life: it is priceless to you. Nevertheless we put prices on other people's lives, because it is the easy way out, is accepted by almost everyone and allows us to avoid having to answer nasty questions. No one wants to honestly say someone unknown is worth nothing to them to keep alive. So you say you will only support health care up to $10K a year, because you know the chance a loved one will ever need more is extremely small. You talk abstract numbers to prevent from having to admit to yourself that you just don't give a damn. That wouldn't fit in with our ethics, would it?
Extremely good analogy. Thanks.
A lot of people equate money with value directly. Only half true...
In the US, we've got ten million unemployed and tens of millions underemployed even when we're not in the middle of the Great Recession. With the proper application of economics, we could easily train tens of millions of more healthcare professionals (note: it doesn't matter if the unemployed are qualified; you can train the qualified-but-otherwise-employed and let everyone else shuffle to fill in the gaps. Hermit crab principle.) and end up with a large enough surplus to treat everyone as to their need.
As employment strategies go, it beats paying people to dig holes and then fill them in.