For example, the retention period applicable for your personal data needed to provide the Riot service to you (such as accessing the games) is limited to your account life. When your account is deleted, Riot will delete the relevant information for that purpose (providing the service to you) but will keep some personal information (summoner name for instance) for other defined purposes such as security and fraud detection. As another example, chat logs/history data is retained for a period of two years from its creation.