There is already much snake oil sales and marketing going on, it's already enabled by arguments that are not based on bodily autonomy, which suggests that a move towards more respect to bodily autonomy will not noticeably increase such snake oil. The resistance to homeopathy has not gone well. I actually believe the resistance is actively harmed by making legit chemicals harder to get instead of easier. When people can easily get the good stuff that works there's not much of a market for the easy to get snake oil that doesn't.