This is cheating. It's not a true client as long as it relies on caching server. By cheating like this, it makes other clients look slow. All of the heavy lifting is done on the caching server; the client is just there to render the optimized feed. Media dimensions, card hydration, user network metrics, all of it is done server-side. This is good for the instant feel that the user gets, but it is not a true client unless it interacts with all of the network without outsourcing to server-side the heavy lifting. Plus, it introduces a centralized choke point that compromises the core premise of #nostr: censorship-resistance.
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