There are limitless uses for AI/ML in UX.
Some examples would be:
Many search algorithms use AI to improve suggestions and customize results.
-Image/Video Recognition and Pattern Detection
Things like people/ojbect detections are used everywhere. From auto-focus on your phone to Facebook auto-tagging your friends.
You see this on a lot of e-commerce sites. AI/ML can be used to display similar products of interest.
-Customize Workflows,Preferences and Content Delivery
Advertising companies use this. You see this everyday in targeted advertising.
-Improve Security Features & Fraud Detection
AI/ML can used to identify irregularities in user behavior triggering security flags and other fraud prevention/security safeguards.
-SEO and Accessibility Enhancements
Lots of sites use AI/ML to generate meta-date and accessibility content. Take a look at the 'alt' attribute on your Facebook profile. Facebook uses ML/AI to auto generate appropriate alt tags from your photos.
There are countless articles on all of the topics you would need to be a little more specifics than just AI applications for UX.