Temporary email can be useful for reducing spam, but it is not a replacement for a private long-term mailbox. Shared or public inboxes can create privacy risks, and an address that expires may not be recoverable. Never use a disposable address for banking, password recovery, confidential correspondence, or other accounts where permanent access matters.
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.