It looks like this system allows easy comparison of reinforcement learning techniques [those techniques can be implemented using any major ML framework]. So it

It looks like this system allows easy comparison of reinforcement learning techniques [those techniques can be implemented using any major ML framework]. So it isn't a competitor to Tensorflow, it sort of allows you to measure techniques built using Tensorflow [or Theano etc]. And the metrics are "how general is this technique?" "how effective is this technique?" Essentially, lots of research says "this technique is effective at this problem," but there is often no way to compare it to other leading techniques in the field. This playground sort of puts everyone on the same playing field. [and since it's open, it seems you can add your own environments. Like if you want to build a Chess AI using reinforcement learning, you can add a chess environment to this playground]