I think reddit can deliver for marketing purposes. Tony, a marketing manager at Amazon, has spent a decent amount of time on reddit, most of it on r/gamedeals, and has generated a lot of sales and goodwill. In fact I think that Amazon has gained a reputation of having better sales than steam does. Unfortunately for reddit, he has done this by building relationships on the site not by buying advertising. That subreddit is anti-advertising, they even banned all affiliate links with the exception of three charities. So investing in reddit can bring results, but ads don't always work.