I think, by the way, that some restrictions should be imposed. It is not about moral or immoral side, but to tell the truth, you can see those restrictions on Forex, for instance. All regulated companies are obliged to tell their customers more about risks and to provide them with transparent information about the ways they can lose money. Those brokers tell their affiliates to conduct this risk policies too. I think something like this should be done in gambling. Trustworthy niche website (affiliates) always want their customers that they can lose more than they can win. And this is a good approach. THe same should be done across the whole board of affiliates to make this industry more moral-friendly.
As far as I know these restrictions you mentioned already exist in some countries, but they apply only to advertisements made inside the jurisdiction of that sovereign state (example: television, outdoors ads). To make such restrictions a requirement for internet ads, I think the platforms used by content creators to promote gambling should enforce it on their terms and conditions.
On the other hand, anyone who feels prejudiced by a fake propaganda, including videos spreading misleading content on youtube, can always sue the channel and the responsible behind it, doesn't matter how far they live from each other. But the costs of the action are really expensive, becoming impossible for most people to afford, because the legal proceedings must happen in the country of the defendant and even the lawyers involved in both parties must be located on that territory.
So the idea of the platform imposing restrictions is much simpler and safer for the public, who is the potential victim.