Nothing. There are no accounts, no analytics and no cookies. Visiting a page or following a short link leaves no record that identifies you.
Track previews and artwork are served by Apple from their own servers, so playing a preview means your browser contacts Apple. Their privacy policy covers that request.
Paths like /spotify redirect straight out to that platform. Once you land there, that platform's own privacy policy applies, not this one.
jonty+ is not open yet and no addresses are being stored. When it opens, this page will say exactly what is kept and how to get removed.
hello@byjonty.com