That would probably cost them a lot more than just setting aside a few of their servers (of which they have millions) to be used by schools. What they are doin

That would probably cost them a lot more than just setting aside a few of their servers (of which they have millions) to be used by schools. What they are doing here is utilizing resources that they already have, so low cost to them. These kids will then grow up using Google apps and many will likely continue to do so outside of school.