The Encryption algorithm of Signal is basically the same algorithms proposed by the US gov in 2000. There is no way they would release these encryption algorithms if they couldn’t break them themsleves
If you would see which organisations are supporting Signal (look at where Signal gets all the money), you would also agree with me. There is no way these organasations are supporting them for your privacy. Why would they? The same people who are trying their best to get all your data. Believing this is just pure naivity imo but call me what you want