Hi Steve. I like the design writing you've done on the Whimsical blog and I've heard good things about your product. I also think this is a clever ad.
But it is just an ad. The content (World Cup) is irrelevant to a design community and the only thing to do on the page is start using your tool. This would work well in a lot of other contexts, like social media, but I don't think it belongs here.
For that reason, I've reported this post and I'd encourage you to delete it yourself. You're obviously doing a lot of things right with Whimsical and it would be a shame to see people put off by tricks like this.