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I would say you are the one who were brain dead.
I am talking what is running as the backend for the app ! https://github.com/MutinyWallet/mutiny-deploy/blob/master/docs/setup-docs.md
You already answered your question here. Both frontend and backend.
And that link is the result from this https://github.com/MutinyWallet/mutiny-web/wiki/Self-hosting Is absolutely the same.
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Multiple backends.
External backends consists of Esplora (ask mempool.space), RGS (This looks new), and LSP.
Additionally, Mutiny uses LN Websocket Proxy to communicate to these LN nodes.
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