[newbusox]

It looks like Creative Commons tries to protect themselves with their disclaimer, which says that their deed has no legal value. I suppose a summary which similarly had no legal value would at least inform users about what the company does (which would be good) but, in the case of a lawsuit, if someone misunderstood the summary (or whatever), they're out of luck. And, anyhow, lawyers are taught to be risk averse. The more they have to think about and worry about the legal complications of something, the more they don't want it to happen. So, for places like Google, or whoever, adding increased readability even in a comparable "deed" would probably come at the cost of their legal department being very upset: and you can bet the second they got sued and the issue of some conflict between the summary/deed and the actual ToS came up is the second they would take that summary down.