I'd much rather see this than any of the commercial adverts.

It is useful information too. Most people won't interrupt or help, and partly because they are not sure how. I saw this recently and it did make me think, if I did see something happening I have a better idea of how I can help.

It also creates an environment where you cannot justify not acting because you don't think you can help, and that we as a society are saying it is not acceptable. If one person challenges harassment that would not have done so before seeing that, I'd count it as a success.