Saw this site doing lots of google redirect how they do it?

I see their backlinks mostly redirect from google

like these if u check their backlink
it show

Redirect Notice
The page you were on is trying to send you to example dot com

If you do not want to visit that page, you can return to the previous page.

from Search Engine Optimization https://ift.tt/3xMRXvH
via IFTTT