Let me site another example, let's take for instance, a club announces that they will pay their players in BTC. This news can also help people adopt BTC.
Of course it would be a great idea for people to embrace Bitcoin as many more people would acquire it, the more demand it will it give to the market. Your idea is actually great but for sure in how many years Bitcoin's existence, for sure your idea were already have been made. Some also already implemented it like giving it as a prize to some public games for people to be aware to it. But let me tell you something, as a business man if you were to promote something without a return to you, would you advertise it? I mean if you were gonna promote something for sure they will give you something in return like cash or any benefits. Some of them doesn't even care about BTC despite it's potential since it's a decentralized system, they can't control it most of the people above love to be involved in something that could be manipulated or control.