Who gets traffic from ChatGPT (aka SEO 2.0)?

So ~2 months ago, OpenAI rolled out its search feature with citation functionality. This means that whenever a user clicks on a citation link, they can be directed straight to your website (you can track this because it appends utm_source=chatgpt.com to every link).

For us, it worked nicely as we have some publications that chat seems to favor when people are looking for health information (curious to see when they’ll start monetizing it).

Have any of you noticed nice traffic spikes by checking your utm_source since then?