I can create an open source project that's very safe too. But where is my assurance thats what runs in the backend? All I know is what I'm sending. I have no gu

I can create an open source project that's very safe too. But where is my assurance thats what runs in the backend? All I know is what I'm sending. I have no guarantee of anything else? It's the exact same problem with adding software the voting process.