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Every time someone reinvents the same concept I post the same message pointing to the many people who have tried and failed to do this.

Here is the last post I did about this, which itself leads on to previous posts about startups doing the same thing.

https://news.ycombinator.com/item?id=7908067

and before that:

https://news.ycombinator.com/item?id=7628532

It's an idea bound to be reinvented forever because people keep seeing nothing that does it and think they have stumbled on a new idea. The reason you can find a site doing it is because it's not an idea that works.