Kylian Mbappe left Paris St-Germain for Real Madrid in 2024, winning a legal battle for unpaid salary and bonuses, including a controversial 'ethics bonus'. This bonus, common in French contracts, is linked to player behavior and image protection. Similar clauses have affected other players like Neymar and Lionel Messi. Bonuses are now significant in player contracts, reflecting the complex nature of modern football agreements. Teljes cikk (bbc.com europe)