Which statement about Scratch Orgs is NOT TRUE?

Scratch Orgs are designed as temporary testing environments that allow developers to quickly set up, test, and iterate on their Salesforce applications. They are created for short-term use and specifically cater to development and testing scenarios, which is why they're not suitable for long-term projects.

The other statements accurately reflect the characteristics of Scratch Orgs: they can indeed be configured and customized to meet specific project requirements, and they can be deleted after their use, aligning with their intended purpose as disposable environments. This makes Scratch Orgs very flexible for development workflows, but they do not support the continuity required for long-term project work. Thus, the assertion that they can be used for long-term projects is not true, as the nature of Scratch Orgs is inherently temporary.