As others have pointed out, alcohol/tobacco manufacturers do in fact have these. However because addiction is a known factor in their industry, I think they ar

As others have pointed out, alcohol/tobacco manufacturers do in fact have these. However because addiction is a known factor in their industry, I think they are kept somewhat in check, if only for legal reasons. I don't think Internet companies have any such qualms, so I would agree that they basically are trying to 'weaponize' this addiction.