I've used DDG as my primary search and it was maddening when they put that stupid AI response thing in there last year because it was not helpful and I'm a huge advocate of AI
Everything is marketing now
You can turn that all off in a few clicks and I believe it is kept in your site cookie so you don't need to log in
There is a very prominent "show always / show on demand / disable completely" button, which you can choose and is respected indefinitely from that point on. That's orders of magnitude better than anything else, and really the best you can do short of refusing to use any AI at all.
Just use http://noai.duckduckgo.com/, which is mentioned in TFA.