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A project has a planned end date, a product typically doesn't.

Isn't it the other way around? Projects tend to never end. Products eventually get released.

A released product is not the end of the product. See: Google, Facebook, WhatsApp, X, Gmail, Dropbox, Firefox, etc.

A release ist just the begining of a product. After that you have to collect customer feedbackand figure out what to prioritize for the next release.

Most modern products seem to have planned end dates.

Development phase is the project. Maintenance phase before sunsetting is I guess another project.