It's misleading because if anyone associates certain properties or beliefs to "startup people" vs. "big company" then they'd almost certainly draw the wrong conclusions about me from that answer. In other words, they would be misled. Likewise, any statistical correlation with other properties or beliefs would be skewed by people like me who were habitually one group but just happened to be in the other at the precise moment of asking. When gathering any sample, it can be useful to know about confounding factors or exceptions.