Idea for 2p2 blockchain betting marketplace

[cecoast]

So people might of heard of an upcoming ico myoddz.bet where they are rewarding investors
with quarterly returns from their ETH sportsbook/casino,(using straight ETH token to bet) users can set there own markets but they need to be verified by human mod or similar not fully decentralized it seems suspect.

Ive thought of a better idea

We can create a FULLY DECENTRALIZED 'BETFAIR.COM' BLOCKCHAIN MARKETPLACE controlled 100% by the individuals on
either side of the coin 'think sports team A vs team B, horse racing et.c ie someone backs team A, someone else in the world disagrees and takes the bet.
marketplaces purely driven by the participants.

Basically we take betfair.com commercially successful model and unlock the full potential of a decentralized blockchain with marketplaces 100% in the hands of its users.

No doubt that this is a billion+ idea, probably already under construction,
The real question is...why hasnt been done yet?

Thoughts?

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[gynoco]

Check Wagger! They want to do this and according to their road map all should be ready until the end of 2019.