Prince Harry won a legal dispute with Splash News, a photo agency which used a helicopter to take pictures inside his home.
It is worth noting that legal dispute did not involve a trial, so the issues were never argued in court. Although Splash apologized to Harry in the court statement, it did not admit specific wrongdoing, and could have argued that it did not in fact breach GDPR. It chose to settle instead.
Source: Prince Harry beat paparazzi using GDPR law, new royal weapon vs. media – Business Insider