While I in no way support habitual gambling, the second you push for something like that, you will have a sizable group of "freedom activists" up in arms. More likely, I see it being more-heavily taxed to make it less appealing.
Any law or regulation has a freedom activists group against it. That's normal, any government has an oppression mechanism that enforces it's will. The whole "civilization" was born when people started restricting somebody's freedom in order to achieve some goals (e.g. water rationing in the Ancient Nile).
So it's not surprising someone would be against restricting gambling. The hard part is to how the gov should do it. But it's not government's job to please every single person.
The problem about more-heavily taxed is that the gambling companies have spotted this and are registered in off shore tax havens.
Even without the addiction problem, a business that allows you to bet on anything happening in society is bound to be the largest vehicle for corruption in the history of mankind. This is a threat to democracy and stability that actually undermines our freedom. Prediction markets should never have been allowed to exist, and if the US is willing to protect this industry, the rest of the free world should sanction it out of existence.