I went to the Polish site and read the article.
They say 5.6 million people participated in the survey, which required them to use VPN services.
That’s of 145 million people. It’s at least conceivable 4% of the population might participate in a survey. Maybe. It would exclude babies. So the % required rises.
What % of the US uses VPN services? Apparently about 35%. Surprising, that, and the number comes from a VPN organization so . . . . Anyway given VPNs are not generally free, this 5.6 million participant number is suspect.