YTM Block is committed to complete user privacy.

This extension operates entirely within your local browser sandbox. It does not collect, store, transmit, or share any personal data, browsing history, or usage analytics with any external server or third party.

Your blocklist is stored exclusively in your browser's native storage (browser.storage.sync) and is only synchronized between your own browser instances via your browser account. No data ever leaves your device to any server controlled by the developer.

The extension makes no external network requests of any kind.