Maybe. If there's more lines of code in the Mongo part than the other part, is the value "primarily" Mongo? What if I made a file upload/download site? Mongo might constitute the bulk of the value/lines of code/whatever.

Words like "primarily" and "including, without limitation" make lawyers nervous.

That depends on how you think a court would weigh the source of value of your offering; and any factor that makes MongoDB more valuable as a component before considering the license makes it more risky when you consider the license.

It's not you that needs convincing, it's the lawyers of the company that's acquiring your Mongo-using startup that need convincing.