In the heyday of blogging, it was pretty common when interacting IRL with someone interested in a particular hobby or interest, to hear that they followed certain blogs that served as a locus for the community. I have never heard anyone IRL bring up Gemini the protocol. Not even once. So, again, someone posting on Gemini will probably find almost no audience compared to the old blogosphere.
I don’t think most of them are concerned about “audience”. There’s not even really a good way to get metrics on anything except page views. It’s very insular, kind of like the Bearblog community (although posts there occasionally leak into the broader world).
Not even sure what the point of linking to a Gemini post from the web is, since no major web browser can view Gemini.