Survata is a YC company that uses those spammy "survey walls", forcing users to answer a survey to get content they want. This data is garbage.
Thanks for your comment. We're constantly testing the accuracy of our network, and building technology to screen out respondents who are lying to us. To date, the results are good. For example, when we ask respondents "Which time zone are you in?" or "Who is the president of the United State" we see around 97% accuracy. We see this as evidence of quality data.