Google検索の国別ドメインが全てgoogle.comにリダイレクトされるように

Over the years, our ability to provide a local experience has improved. In 2017, we began providing the same experience with local results for everyone using Search, whether they were using google.com or their country’s ccTLD.

Because of this improvement, country-level domains are no longer necessary. So we’ll begin redirecting traffic from these ccTLDs to google.com to streamline people’s experience on Search. This change will be rolled out gradually over the coming months, and you may be prompted to re-enter some of your Search preferences in the process.

It’s important to note that while this update will change what people see in their browser address bar, it won’t affect the way Search works, nor will it change how we handle obligations under national laws.

Here’s an update on our use of country code top-level domains. (Apr 15, 2025)

2017年には国別コードトップレベルドメインの使用に関係なく、ローカライズされた検索結果を提供できるようになっていたとのこと

という事で、国別コードトップレベルドメインが不要になり、トラフィックをgoogle.comにリダイレクトするそうです
変更は今後数か月かけて段階的に展開するとのこと