I absolutely agree about artificial demand, especially in situations of addiction or mental trickery. So I think those should be regulated.

I guess what I'm trying to say is, when you reduce someone else's consumption, you're saying you know better than them what is good for them. That can often be the case, like in gambling, scams, addiction, and a lot of marketing. But it can be dangerous if you don't actually know better than them what's best for them, but think you do.

I guess consumption is a bad word for it. Those activities you mention still have an opportunity cost associated with them, but you're right, they shouldn't really be called consumption. Let's say allocating your effort? People usually know themselves better than someone else how they can allocate their effort for their own good. Limiting how they can do that should only be done when you're pretty sure you know better than them what's good for them.