Its important to note that embargo agreements and NDAs are not the same thing. In my experience NDAs usually apply to behind closed doors looks at titles far before their release. They both essentially serve the same function if you want to simplify it, both involve keeping information under wraps but the difference is that NDAs usually involve never giving out specific pieces of information on pre-release builds and embargos are designed to keep details and critique under wraps until a set time when they can be released. There's a lot more nuance to it but that's my experience of the differences. For instance I'm under NDA on several in-development games, but I will then be given an embargo for the review version. With an NDA you're usually not allowed to even mention that you're playing the game, embargos just restrict the release of information about said game until a certain time.