Temporary email does not automatically make a person anonymous. Websites can still collect IP addresses, browser information, account details, and other technical data. Email providers may also keep logs according to their policies. Think of temporary email as a way to limit exposure of your primary email address, not as a complete anonymity tool.
For practical use, always review the provider rules and avoid sharing sensitive information through temporary inboxes. A temporary address is best suited to low-risk, short-term interactions.