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Field Service Injuries
I don't think you are likely to get hurt playing cards on your computer. And, if you have a beer, in the comfort of your own home, getting hurt is not very likely either.
However, there are plenty of ways one can get hurt in field circus. What about the fall down the stairs? Elderly people, and people in general in slippery conditions, have to worry about this one. All it takes is one good slip, a trip up, or a bad stair tread, and you are going down. It is possible to split one's head open in this kind of a fall, and breaking a leg is quite common.
And, traffic is a worry. What happens if you get into an accident while out in field circus? The Washtowel isn't going to do anything about it. Or, getting hit by a car while crossing the street because you are in a hurry to get your time started. This can happen to people of any age. And, there is what if you get mugged because you are working a bad area? Injuries in the homes are possible--as well as catching something like tuberculosis at the door. Then, there are dogs, guns, pepper spraying householders, and doors slammed in faces where someone gets hurt.
All this, and the Washtowel Babble and Crap Slaveholdery will not accept liability.