It's brilliant for Google to offer free internet to any metro area, and maybe even rurally though that gets more complex logistically. Google doesn't need ISP fees, they to keep up market share and ad clicks. Even a linked logo to Google will probably create enough ad clicks to justify the cost here and certainly if you include brand awareness it's worth the money for them.
A drop in Google's bucket of cash to consolidate the position as search leader.

Where the HECK are Yahoo and MSN when all these cool initiatives spring up?