Safety is a big bag that includes a lot of things, with a lot of players. In 2013 we learned about one of those players, laws made to support them, and having f

Safety is a big bag that includes a lot of things, with a lot of players. In 2013 we learned about one of those players, laws made to support them, and having faith that that player won't act instead of having a non illegal way to verify that it is happening. For both open and closed source you can have security bugs and vulnerabilities, and depending on the attitude of the developers or the community behind it could be or not easier/faster to be solved on open source, but you can't bet on that. But what is at the very least harder (or at least is in your hand how far you want to go to check about it) in one side is to include unnoticed backdoors, trojans and other gross things against your interests as user. And yes, backdoors and intentional security problems can be introduced even with a duplicated line (https://nakedsecurity.sophos.com/2014/02/24/anatomy-of-a-goto-fail-apples-ssl-bug-explained-plus-an-unofficial-patch/ https://nakedsecurity.sophos.com/2014/02/24/anatomy-of-a-got...). Is not a safe against all protection. But it lowers the bar.