Unless things have changed, the survey is opt-in and thus it's a statistical sampling. Over the many, many years[0] that I've run Steam, I've gotten the survey

Unless things have changed, the survey is opt-in and thus it's a statistical sampling. Over the many, many years[0] that I've run Steam, I've gotten the survey pop-up maybe 4-5 times, although I'm not a heavy gamer so Steam isn't installed and running all the time. [0] Since HL2 or maybe the Orange Box. I'm old.