If you are in the EU or UK, your data may be transferred to the US or other countries under mechanisms like Standard Contractual Clauses, but these transfers carry inherent legal uncertainty following cases like Schrems II.
Riot Games collects extensive personal data including gameplay telemetry, device identifiers, purchase history, and communications, which are shared with third-party advertising and analytics partners. Users in the EU, UK, and California have legally enforceable rights including the ability to access, delete, or export their personal data. You can submit a data access or deletion request through Riot's privacy request portal at https://www.riotgames.com/en/privacy-notice.