Is Rabby Wallet safe to use?

I heard someone on reddit say that only some of their code is actually open source. Personally I feel like software that pretends to be open source but actually isn't, is worse than proprietary. Other than that Rabby seems like my dream wallet. I did some research and apparently it's made by the people who make DeBank, so at least they're not affiliated with any sketchy governments or anything. Is there any way to know that they're not gonna jack all my crypto if I use this wallet?