They're a non-profit org, and their products are distributed free. AFAIK, time and effort are contributed/donated, but if you're interested in details:
Sorry, I was being facetious. Look at private universities, they are technically “non-profit”, but Stanford has more in its endowment that some states have in their budget. Stanford has just under a $28,000,000,000 (that’s billion, with a B) endowment. The states with a $28 B or less budget are (in depreciating order)
Nevada.........................26.3 B
North Carolina.................23.9 B
Minnesota......................23.9 B
Connecticut....................21.5 B
Mississippi....................21.1 B
Utah...........................21.0 B
Indiana........................21.0 B
New Mexico.....................19.1 B
Kansas.........................18.4 B
Hawaii.........................15.4 B
North Dakota...................14.7 B
West Virginia..................13.8 B
Rhode Island...................10.0 B
Nebraska.......................9.7 B
Wyoming........................8.9 B
Iowa...........................8.9 B
Alaska.........................8.3 B
Oklahoma.......................8.1 B
Maine..........................8.0 B
Idaho..........................7.9 B
Vermont........................6.0 B
New Hampshire..................6.0 B
Montana........................5.1 B
South Dakota...................4.9 B
Delware........................4.5 B
So, if the government would confiscate all of Stanford’s endowment, they could fund the bottom 5 states for an entire year, or 10% of the entire country for a year.
Just something to think about regarding scale, etc.
< and many of those states are much older than Stanford >