I mean, the historical solution to this type of stuff just hardline regulation? There isn't a general solution against bad decision making. Your toddler will drink that liquid under the sink -> you put that liquid in a really high place and now everybody will complain and have to find that stepladder every time they want to clean the drains.

The best non-regulatory fix I can think of would be socially enforcing that people stop profitting from convincing others into doing bad decision making.

It's not very easy though, since fraudsters only need to convince people once to make off with their profits, unlike a tradesman or manufacturer who needs to stay in business long-term.