I have of course tried to search for this, but if you include the word 'AI' in a search, most search engines believe you are in fact searching for AI.
From the homepage:
This search engine isn't particularly well equipped to answering queries posed like questions, instead try to imagine some text that might appear in the website you are looking for, and search for that.
Where this search engine really shines is finding small, old and obscure websites about some given topic, perhaps old video games, a mystery, theology, the occult, knitting, computer science, or art.Machine Learning algorithms, which include some really straight-forward ones like decision trees, linear regression, support vector machines, etc. are pretty ubiquitous.
If you mean generative AI models (e.g. what powers ChatGPT, Dall-E, etc.) then it's a different story.
Do you want to avoid the company engaging with AI? (Maybe because you don't want your searches being used as training.)
Do you want to avoid LLMs answering your search? I have not seen that widely adopted at all.
Depending on what you consider "AI" the answer might range from all of them to none of them are using AI.
[1] https://kagi.com
Asking questions in forums has been a habit I picked up recently.
The process of writing it down and describing it to other people really helps a lot than I expected.
To use it you have to crawl the web first though.