What about them? I have no fundamental problem with them. The only reason I would sign an NDA is, when I am doing paid work.

But aren't these examples of having to follow someone else's rules after you've left their house?

So what? It is part of the deal, and as I wrote, I would sign an NDA only for a good reason, that is usually a paid job. Also, the NDA concerns only the specific task and not other things I am doing at that time or later.