Hi, it will be open sourced when it's ready. Maintaining open source software is incredibly stressful and my focus right now is on adding features and improvements so please have patience with me! I know it's very important to some users but there are also trade-offs from my side. Right now I don't have any overhead of maintaining a public project and I know every line of code in Connect which helps me to fix bugs quickly or add new things. It's also nice not having anyone to blame but yourself for bugs introduced. If you're looking to contribute code or lend your time I'd suggest going over to the main Lemmy codebase for now until Connect is ready.
Cheers, Kuro