Why? That ship has sailed long ago. HTTPS is a requirement for browsing the web in 2020, just as HTTP was in 2000.

Most of the browsers that can't do modern HTTPS run on operating systems that shouldn't be on the public internet because of security concerns in any case, so that leaves perhaps a few really fringe browsers. Come to think of it, I can't even name one of them — even text-based browsers like Lynx work with DuckDuckGo (you end up on this Lite version).

Embedded systems can use internet securely without HTTPS.

Good point, but embedded systems don't generally act as an agent for a user to browse the internet. Their endpoints tend to be known API's. You wouldn't use DuckDuckGo from an embedded device like that until you reach the level of a full-fledged modern OS with an up-to-date browser (e.g., Linux running on a Raspberry Pi). It would be meaningless too, because even if you could use a search engine without HTTPS, almost all of its linked results will require it.

The internet can be used without HTTPS, but you can't expect to browse common websites without it.

Since they value privacy, I don't think this request would ever be honored.