Could be, but I don't think so, because I use Ecosia, which is even more of a Bing skin than DDG. DDG adds some of their own flair into the mix, but Ecosia is pretty much just Bing I believe. In any case I don't feel like I'm getting much in the way of AI spam. For the few searches I do try on Google, I think it's safe to say that Ecosia/Bing is now a better search engine that Google.

Realistically I think it has more to do with the terms your searching for, and not necessarily if one search engine is worse hit by spam, AI or otherwise.