If you just want to serve static files between browsers, you can do that with WebTorrent. I also searched “webrtc rpc” and found another piece of the puzzle.
I suspect that running arbitrary computations on peer browsers is uncommon today because verifying the output of an RPC executed on hostile machines is nontrivial unless you’re serving static files with a known hash, mining crypto, or solving an NP problem. I guess you’d also need a quota system to prevent users from taking over your botnet’s CPU time by spamming peer browsers with expensive RPCs.
I suspect that running arbitrary computations on peer browsers is uncommon today because verifying the output of an RPC executed on hostile machines is nontrivial unless you’re serving static files with a known hash, mining crypto, or solving an NP problem. I guess you’d also need a quota system to prevent users from taking over your botnet’s CPU time by spamming peer browsers with expensive RPCs.