Crypto.com offering a "deposit service" in which customers can deposit coin and earn interest. Huobi has what appears to be a peer-to-peer collateralized lending platform. If the OP is correct about his address belonging to crypto.com, it is possible they are using some of their deposits to fund loans on Huobi's platform.
I've had a good look around crypto.com's website and blog, and I can't find any obvious links to Huobi. Indeed, their "Crypto Earn" platform which you are referring to makes no mention whatsoever as to how the interest they pay you is generated, which I find pretty shady in and of itself. Their "How does it work" page
here simply talks about how to set up an account and deposit coins, and their Terms and Conditions for the earn account
here says nothing about they use or store any deposited coins.
While I don't trust any of these "earn interest" platforms, at least the other ones I have seen say quite clearly in their Terms and Conditions that they will give your coins out to third parties as loans, investments, etc. Crypto.com not even telling you what they are going to do with your coins is even worse.