The same thing happened to me a couple of weeks ago. Got a patronising mail from dinos.co.jp (ディノス) saying they were increasing their security measures and that

The same thing happened to me a couple of weeks ago. Got a patronising mail from dinos.co.jp (ディノス) saying they were increasing their security measures and that I should change my password. I went and checked a few news sites and sure enough, they'd just had a massive breach. Disgraceful to not disclose it in their mail, IMO. Ironically, they also preached how important security is - パスワードは、お客様の財産を守る重要な情報です (passwords are important information that protect your assets).