This is a moral stance that not everyone agrees with.
You frame as if agency exists, then exploitive coercion doesn't exist.
We can respect the agency of folks to smoke or drink, while also criminalizing lying to entire populations about the known health effects of your products.
We can respect people as having agency, while also acknowledging that psy-ops like those run by Cambridge Analytica, or even normal psy-ops like mass market advertising, can influence groups of people through deceptive or manipulative ways in aggregate and cause massive harms.
We can respect personal agency while also acknowledging some folks have addiction problems, addictions problems be intentionally manufactured by products and platforms. There is a balance between allowing a poker game, and allowing the MGM Grand to plant a limo driver in a recovering addict's driveway.
We can respect agency while acknowledging those with large reach because of wealth can cause mass harm through media, influence and coercion if unregulated.
We can grant authorities to police and politicians without Qualified Immunity from consequences of their actions.
1. If someone knows all the information, but still chooses to make the wrong decision.
2. Someone is being told wrong or incomplete information, leading them to make the wrong decision
3. Someone is being forced by external means into making an wrong decision.
Two and three are already illegal, under fraud and coersion.
Im solely talking about 1. Because if you don't believe people have full agency in that regard, you have to prove to what extent can you determine what is deception. You can't just willy nilly say that something feels immoral, and therefore should be banned.
If so, would you accept the following as moral actions?
Financial adviser charging substantially above-market fees to recent widows, who lack experience in finance (All information is available, but not understood)
Selling heroin outside of a drug rehab clinic (All information available & understood, but under compromising circumstances)
So, what does it mean to choose something with full agency?
Also, on a semi-related note - there is the legality of gambling, the legality of running a gambling operation, and the legality of doing so for pecuniary gain, and it is possible for just part of these three to be illegal.
When you see an attractive woman, do you have a choice about whether you think she's attractive?
I would say that is so instinctual as to not be a choice, even though different people have different opinions about who is attractive. And yet we know that men in particular go to great lengths to be with attractive women, some to the point where it becomes an obsession.
What about food? Do you not like things that have a bit of fat, sugar, and maybe some crunch to it? There are clearly people who, despite having all the necessary information, will eat too much, to the point where they become ill from it. How is that a choice?
More seriously, it seems like you have an uncommon view about good ways for people to relate to each other. You may recall that humans evolved to live in large, cooperative groups :)