map.yahoo.co.jp is a subdomain operated by Yahoo Japan, one of the country's oldest and most trusted internet companies. The page you see now is just a notice telling users in Europe and the UK that most Yahoo Japan services are no longer available from those regions. That's a compliance measure, not a red flag.
For a major brand like this, you don't need an about page or contact form on every subdomain. The company's identity is clear from the domain and content. Security is strong with modern encryption and no blacklist history. Bot protection is normal for large Japanese sites and doesn't affect regular visitors.
If you're in Japan, this site is completely safe. For users elsewhere, the notice is genuine. There's no scam risk here. Just understand that this subdomain isn't the main Yahoo Maps service — it's an announcement page tied to regional restrictions.