Exposed api key in documentation

[NiteeshK21]

dist/samples/web-components-map/docs/index.html

Documentation Link : https://developers.google.com/maps/documentation/javascript/add-google-map-wc-tut

This index.html documentation file has an api key hardcoded and it works as well. Is this intentional ? If not can I use it for a personal project ? how long will it be valid for ?