A very interesting excerpt, apparently from the site's owner himself[1] regarding copyright and ad revenues:
"For years, I’ve had to watch how invisible frames have been attached to many websites that load my site. Such ‘malicious’ traffic has increased immensely and is becoming an increasingly large problem, because ads cannot be displayed to those users.“ Usually, Matesanz’ portal monetizes the site via imbedded ads. If these happen to be loaded in the background on third-party sites, they cannot be clicked. Fake traffic doesn’t generate any money and damages campaign performance on the site in the long term."
"For years, I’ve had to watch how invisible frames have been attached to many websites that load my site. Such ‘malicious’ traffic has increased immensely and is becoming an increasingly large problem, because ads cannot be displayed to those users.“ Usually, Matesanz’ portal monetizes the site via imbedded ads. If these happen to be loaded in the background on third-party sites, they cannot be clicked. Fake traffic doesn’t generate any money and damages campaign performance on the site in the long term."
[1] http://www.onlinemarketingrockstars.de/philip-matesanz-youtu...