According to the one article I found online, a lot of new crypto services are based on the ETH blockchain:
A reported 94 out of the top 100 blockchain projects have launched on top of the Ethereum network. Ethereum as of mid 2018 has a market cap of $52.3 billion USD, but that doesnt properly show its ubiquity as the leading dApp platform for developers and blockchain startups.
So I think there should be no reason to be concerned regarding the blockchain that Zeex is based on.
This is a really huge percentage, shows us how many teams have trust in the Ethereum blockchain.