Not seeing how starlink can’t just put a hd and serve stuff.

You'll need a way to find which starlink has the hdd that has the data you need to access.

Content-based indexing (as in IPFS) handles that. Plus the data gets cached in the starlink you locally accessed, in your example.

It might help to think about IPFS as a public CDN operating on an open specification protocol and an open-source implementation.