The Gemini protocol is intended to exclude features that could be used for tracking. It has no cookies, user-agent, referer, etc and the protocol is not extensible enough that such features could be easily added.
Also, frankly, the spartan design of native Gemini pages (very limited formatting, no scripts or even inline images!) means that the circle of nerds who use Gemini will almost certainly remain too small to catch the eye of ad-tech. It's hostile to commerce in a way I find kind of delightful.
> It has no cookies, user-agent, referer, etc and the protocol is not extensible enough that such features could be easily added.
For now.
The original HTTP (now retroactively called HTTP/0.9) also had none of these, and also wasn't extensible enough; it had no headers at all, just the verb (GET) and the path. Yet somehow, it was later extended to include all of these.
> very limited formatting, no scripts or even inline images!
The original HTML was also like that, even inline images came later.
Also, frankly, the spartan design of native Gemini pages (very limited formatting, no scripts or even inline images!) means that the circle of nerds who use Gemini will almost certainly remain too small to catch the eye of ad-tech. It's hostile to commerce in a way I find kind of delightful.
https://gemini.circumlunar.space/docs/faq.gmi