The entire purpose here is to build a community of people who care about this sort of thing, who write content for that community, where taking your content away from that community is not an easy decision of adding a <script> or <style> tag.
Maybe there's another way?
For example, Gemini could only link through a centralized link management server, and that link server will verify links to be "clean" , and if a link isn't clean it will become dead ?
Of course, that depends whether said link gets most of his traffic from within Gemini or outside.
Hmm...
Have you ever spent any time in small communities? It's lovely to just... not have to care about gaining followers or making arbitrary counters go up or whatever it is people do, and just talk/create for the sake of it. There's no "brand" to care about.