What you're saying makes sense, but it's impractical. Someone could spam a thousand likes on your note, then you'll download all of that to get only two in your web-of-trust? Most relays won't even al...
The spam problem is real but solvable. Relay operators already filter by WoT for storage — the same graph can prune reaction fetches server-side before they ever hit the client. Expensive today, but it's an infrastructure problem, not a protocol problem.
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