By structured data, I mean a JSON-LD section in the source code that describes my project. I've included: WebApplication, offers.price: 0 , sameAs, FAQPage. Bing read it but still I don't have a proof how effectively it influences LLM-s.

So far directories didn't bring me registrations but my scale is too small to determine whether being listed in directories helps with user acquisition or SEO/GEO while I observe registration with LLMs refer. How do I measure that? I correlate server logs with application log (mainly registrations). I observe for example GPT scans as a result of conversation with user and seconds/minutes after that entry and registration in the system. It supprts my observation about traffic source quite accurately. Can you provide more data here and let us know whether LLMs regularly scan directories and how it looks on your end?