If you stumbled across region1.app-measurement.com and wondered whether it's a scam or fake, the answer is straightforward: it's a backend server used by Google for app measurement. This isn't a website you're meant to visit — it returns a 404 page because it's an API endpoint, not a store or blog.
For a technical service like this, the normal trust signals — about us pages, privacy policies, and contact info — simply don't apply. What does matter is that the domain runs on Google's own infrastructure, uses a valid TLS certificate, and hasn't appeared on any blacklists. The only minor flaw is that it still accepts outdated TLS 1.0/1.1 connections, but that's a detail rather than a danger.
If you're seeing this URL in your network logs or app analytics, there's no reason to be concerned. It's not a phishing site or a fake shopping page. It's just a piece of the measurement machinery that powers features like Firebase Analytics and Google Ads attribution. Treat it as what it is: a trusted part of Google's ecosystem.