We chose Ethereum network for FreelancerCoin because of several reasons.
1) Ethereum has a high “immune” system where a third party can’t make changes to any data.
2) It has proven itself that is corruption free because of the impossibility to make any censorship.
3) Apps connected to Ethereum rarely, almost never go down and cannot be shut down.
4) Easier to find developers who have already experiences with Ethereum.
We have a plan to build a sub blockchain system for blockchain certification system and blockchain rating system but we didn't decide to use Ethereum for them. We are considering other blockchain systems as well. Because Ethereum has a gas fee and if we want to put quite big data as a smart contract in Ethereum then we expect to pay much gas fee.
Thank you for your interests!