also - open source requires any proprietary licensed software to be released as well - this can be via a company grant (companies like Cisco, Microsoft, Oracle, etc will often give grants to certain open source products, some companies like IBM will rescind their grants and thus require the open source project to build their own solution or pay up; and some grants are done via payments - open source products (such as Linux are filled with grants - and some of the enterprise versions include pay-for grant software to be embedded.)
so going "open source" can require a lot of redevelopment and legal work (to avoid plagiarizing someone's code you don't want to pay for, for example). and if one believes the NSA that the open source Linux is the most secure product you can get, you might check on the news about China switching away from Windows due the the NSA key found, and then wonder, how much of the critical parts like crypto, etc are already tainted by the US security operations... oops.
if you want to use a computer and be secure / have privacy - turn it off, burn and bury it. otherwise, welcome to the 21st century ?