I don't agree at all, there are a lot of advertisements that aren't "legit" not only ICO scams. Every investor is responsible for his buying behavior and research.  Next to that there should be freedom of marketing to promote your products.
I don't think all these "get slim now", "start earning now 10k a month " is good advertisement, yet they are also there.

Again, power is lost about what is going and that scares them. So they prefer to get out and even share that "in the future there will be a own blockchain/coin" then that they support it now.