No, it's even less secure than expected. We expected that Sunbird would have access to your Apple ID and messages. Instead, everyone in the world has access to your Apple ID and messages.
Yeah, but I got absolutely roasted in YouTube comments for pointing out some potential shortcomings in the architecture. I’m not about to claim a high level of authority on the topic, though I’m an old man who has been in the game for a while, but the people that were totally confident really just seemed very eager to accept the passing of their credentials in a very sketchy way to get a slightly different messaging experience.
I don’t get the buzz around this. It’s a really ugly hack, it’s costing someone money to run those mac servers, and the longevity of the service is questionable.