How do you know they do not?
Software is designed by humans and as such is designed to be controlled by humans.
“How do you know they do not?”
Because I have been dabbling with it for years now. It belongs to whoever wants to use it. And it is open source, nothing hidden about the software at all. It is wide open for all to review. And because you can use or not use nodes as you like one can set up a very secure and trusted network that has nothing at all to do with any other untrusted nodes.
Like say... Just FR members in the network... No problem. :)