From what I can see, these are search providers and vanilla Firefox ships with all of these as well, I think. You will find these under search settings rather then add-ons. I don’t think there’s anything nefarious about including search options used by a lot of people, especially when they include ddg side by side.
Why don’t you reach out to the Garuda team before jumping to conclusions and maybe work with them to remove problematic search engines and add more privacy aware ones?