Re: Pot, Kettle
I installed it in Firefox and I switched to Ecosia for search, it hasn't stopped me. (I use DDG as my search engine anyway, so I tried to confirm your statement. At least on Firefox, that isn't true, you can select any search engine you want.)
If it is forcing the change on Chromium browsers, that is bad. I get they are trying to make the experience more private, and it is, after all, a plug-in for a search engine provider. But they should still respect the user's search choice, even if that defeats the whole point of using the DDG add-on.