The first time the Gatsby command line tool runs, it may print a short notice about anonymous usage data. The notice is easy to skim past. This note explains what it means and where the authoritative details live.
What the notice is
The notice is a disclosure, not a request for personal information. It tells you that the tool may collect aggregate data about how commands are used. The purpose is to help the maintainers understand which parts of the tool matter.
Read the source of truth
Telemetry is a moving target. The official Gatsby telemetry page is the place to check what is collected, how it is used, and how to turn it off. Read that page before you decide. It is shorter than the tool's documentation and more precise than a summary in a blog post.
If you want a quiet machine
The telemetry page lists the environment setting that disables the collection. If you are working in a shared environment, a container, or a CI job, decide once and record the choice in the project's setup notes. A small note now saves a conversation later.
A reasonable default
For a local project, leaving the default in place is a common choice. For a machine that handles sensitive work, turning it off is equally reasonable. The important part is making the choice consciously instead of clicking through the notice.
A notice is not a contract. Read the page, decide, and move on.