Short version: very little, and only with your say-so.
I use Google Analytics to see which pages people find useful. It only runs if you accept it in the cookie banner. If you decline, no analytics cookies are set, and any that exist are cleared. IP addresses are anonymized.
No ads, no ad tracking, no selling data, no third-party trackers beyond the analytics above. The booking page (Cal.com) and any external links run on their own terms when you use them.
Your consent is stored locally in your browser. Clear your site data to be asked again.
Questions about any of this: [email protected].
I use analytics to see which pages are useful. Nothing else. You can decline. Privacy