Even though it is marked as valid by fraud detection tech; it is likely still not human. Notice the surges in traffic on the last day of the month. There's not a bunch of humans sitting around with nothing to do but to go to those websites on the very last day of the month.

1. September 2018 / Page 0marketing.scienceconsulting group, inc.
linkedin.com/in/augustinefou
“Sourced traffic” is not human
Even though it’s marked as “valid” it doesn’t mean it’s human
Choose Your “Traffic Quality Level”
“Valid” traffic
costs more
Surge on last day
Surge on last day
Surge on last day