The biggest reason for planetary protection guidelines is the risk of life escaping from the spacecraft and being mistaken for native life. The moon is so ridic

The biggest reason for planetary protection guidelines is the risk of life escaping from the spacecraft and being mistaken for native life. The moon is so ridiculously inhospitable that it isn't much of a concern because no known life can survive without air or water, even before taking into account the extreme temperature swings. Somewhere like Mars or Europa has much more strict guidelines. Also, we sent people to the Moon, which are a lot messier than silkworm eggs.