Ahrefs: 230k organic traffic valued at $124k SEMRush: 558k organic traffic valued at $355k
These are estimates and can be widely under or overestimated but they show that this is happening on a very large scale.
For a quick idea on how this is possible I looked at their top pages (according to Ahrefs). Their top page is ranking #2 for the keyword "interia" which has 207k searches per month in Norway and is rated as 0 (out of 100) for being easy to rank for. Usually when a keyword has that amount of searches it would be incredibly hard to rank for, I've never seen anything like this. So what is happening here looks like they are just taking advantage of a market with really low competition keywords.