[gichiba]

Not so - a blockchain or other type of decentralized shared ledger is required for the reputation system to work as it should. Reputation needs to be calculated and verified so that it can exist independently of some sort of gatekeeper or platform (as you are implying).

Tokens on the network also are essential for Colony governance (voting, dispute resolution, dividends/rewards, etc.) - This is why Colony is built on Ethereum.