@koil Because they're c***s, basically.
If you block notifications, they show a fake one that looks exactly like the native one š
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I have a dark theme, so the real one would show up with a dark background.
If you click Allow on that one, they will start a download of something called "MailOnlineSetup.exe", probably malware in disguise, and tell the user to install it with a big red "click here" prompt.
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Which of course won't work in Vivaldi because the downloads don't show there. Idiots. š