I don't disagree, but stock trading ads are in some ways already more strictly regulated than gambling ads here. Gambling ads are required to have a vague "please gamble responsibly" statement, but ads for CFD trading platforms are required to have a prominent warning stating the exact percentage of their accounts which lose money (often >75%). The gambling ads don't have to tell you the real odds of coming out ahead.

e.g. https://www.youtube.com/watch?v=KM_zuudkSnY