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The first and largest obligation that Dropbox has is to their users, not to one of the many partnership emails they probably get constantly.

Really, your last sentence there is unnecessary.

If you're posting a bizdev email, I would just assume you would respond, even if it's with a "Sorry, we're heads down on other stuff" response.

3 weeks without a response makes me think they don't even bother reading it.

If your email to them reflected this tone in any way, I can see why they didn't answer.

Your mental leap from "They don't want to partner with my company" to "They don't want to make money" is a bit off.

If they want to reply with the fact that they don't want to partner with us, that's fine. We simply wanted to add the feature to our enterprise application and were ready to pay licensing for 2000 users (and growing daily). The problem is, they didn't even respond with that - so my assumption is the bizdev email is being forwarded to /dev/null at the moment.