As mentioned elsewhere in here, it’s ultimately gambling. It’s putting money up, exposing it to risk that could completely wipe you out. If someone doesn’t understand that about stock investing, I think they’re very similar to someone not realizing a casino could wipe out your money. But making sure everyone fully understands this - educating people who are risking money - certainly seems like a thoughtful thing for countries to incentivize.
But unless all the financial websites have to be styled to look like a casino, or areas of a physical bank space put up neon lights and blinking signs to emulate Vegas casinos, I don’t know if we can ever drive the point home clearly enough.