[Vinnl]

I don't know what you intend "hidden" to mean, but they're not lying about it:

> DuckDuckGo is part of the affiliate programs of the eCommerce websites Amazon and eBay. When you visit those sites through DuckDuckGo, including when using !bangs, and subsequently make a purchase, we receive a small commission.

> This mechanism operates anonymously and there is no personally identifiable information exchanged between us and Amazon or eBay. These links are regular organic links (like any other link in our results) and these programs do not influence our ranking or relevancy functions in any way. That is, they are not advertising like paid placements or paid inclusions, and we only generate revenue from them if you ultimately find them relevant enough to end up purchasing an item.

https://help.duckduckgo.com/duckduckgo-help-pages/company/ad...

[erikbye]

Qwant does this, too.