Well, if you've never heard of a company offering that service/product, then you're probably not alone there. Someone offering a product doesn't mean they have

Well, if you've never heard of a company offering that service/product, then you're probably not alone there. Someone offering a product doesn't mean they have saturated the market for it, or even made the average customer aware that they exist. Even if they do exist, and they have saturated the market, the fact that you still want to build a different product might mean there is innovation left to do in that space. So no, I don't think anything is really done to death. If you want to do it, go with your gut.