Even if there is no explicit regulation that bans you from doing that, I would not be surprised if they decide to cut you in one way or another. I mean, it is just common sense. If they know you consume a lot of electricity, they would get suspicious and would think what you've done is unethical at the very least. If your definition of meaningful is not limited to generating passive income, I can see other usages such as running a node, a NAS, and so on.