you can use bitcoin on solana through a trusted intermediary the analogy is sound but it would be even more accurate to say primal is coinbase

You can have wrapped bitcoin on ethereum and other chains. In the source code Semisol and others have pointed out how their cache relay works and how they reconstruct notes in which they are replacing users media links with their own primal links. By altering the note they remove authenticity. Even if it’s the same media they have altered the note by removing the users media link and added their own link in which the user never signed or agreed to. What’s stoping them from altering an image now that they control the media file. This alone is enough reason to consider primal not a Nostr client.