The methodology behind this study looks okay but it isn't necessarily representative of real world use. The study looks at the front page of around 200 news sit

The methodology behind this study looks okay but it isn't necessarily representative of real world use. The study looks at the front page of around 200 news sites in Europe with a browser cleaned of all cookies. However in all cases the IP address belonged to a machine at the university of Oxford so it probably had some history attached to it. It shows some reduction in cookies served before user interaction but it isn't clear is this is due to GDPR or other changes that have been made over the 3 month period. My summary is that the data found is not statistically significant given the relatively limited sample size and lack of any control sample to compare against showing usual variation over a 3 month period.