An important point is that advertising, tracking, all the junk which the OP link demonstrates, is technically not possible in the gemini protocol. It is designed to be minimal and serve text and single media files.
The gemini client is not a site-specific app, but a very lightweight browser for this protocol. All available clients are free and libre ipen source programs.
The slight technical ceremony is, a bit tongue-in-cheek, needed to keep the umwashed masses away.
And the technical and media limitations are - and here I am totally serious - needed to keep boundless greedy corporarions away which sooner or later destroy every living or creative thing they touch.