Yes it supports DDG and every major search engine (see: GitHub). You might have to manually give it permission first (like for specific SearXng instances), after which it’ll work.

If you meant can you add DDG as a search shortcut, also yes.

So uBlacklist actually removes sites specified in your subscribed rulesets from your search results.

I found it helped out a lot on programming or tech support searches, as there’s so many content mirrors and SEO spam sites for that domain.

I also found that using search shortcuts has helped me reduce the need for the middle-man in a surprising amount of my searches. (e.g., “@w” for Wikipedia, “@g” for the Gentoo Wiki, “@git” for GitHub, “@p” for ProtonD, “@y” for YouTube, “@s” for Stack Overflow, et cetera)

Try uBlacklist, with these blocklists:

# AI Spam
https://raw.githubusercontent.com/laylavish/uBlockOrigin-HUGE-AI-Blocklist/main/list_uBlacklist.txt
# Copycat Sites
https://raw.githubusercontent.com/quenhus/uBlock-Origin-dev-filter/main/dist/other_format/uBlacklist/global.txt
# SEO Spam & Junk
https://raw.githubusercontent.com/NotaInutilis/Super-SEO-Spam-Suppressor/main/ublacklist.txt