Great idea!! I don't think it's morally gray. First of all, every artist loves the sharing and advertisement. Secondly, yes, putting the content - which is not yours - behind a paywall might seem gray but I think it's fair because, often, and very often serving as a bridge is no small task. Information, valuable information, has always been pricey, and laughably that has always been the easy part, a bargain if I may say. Getting access to it has always been the hard part. The only concern, often, has been, people not putting effort into sieving the content, not worrying about it's quality, basically being a bridge to shit and slop. Nothing is more annoying.