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Agreed, IMO it's silly and almost feels like a dark pattern for an innocuous seeming link like that to require an extension installed. For those who already have the extension, see [1]

[1] https://i.imgur.com/NfOYhDu.png

The title makes it sound like it's DuckDuckGo Email. Which it isn't, it's email protection. Which isn't explained at all.

There is a "Learn more" link: https://www.spreadprivacy.com/protect-your-inbox-with-duckdu...

This is helpful but again does not appear on the page that OP linked to if you don't have their app or browser extension installed.

I didn't realize that, I already had the extension