One more red flag - team says that they won't fully open the project source code
Regarding open source code, do check out this article.
https://medium.com/essentia_one/is-essentia-open-source-f7355cebbe71"
Were still big believers in decentralization and were definitely still going to publicly release sections of Essentias code. Those parts that we believe will contribute to the blockchain ecosystem and cannot be used for unintended purposes will be added to our official GitHub. For example, not so long ago we released the API wrapper written in Python that allows you to communicate with Essentia bridges RESTful APIs. This particular section of code is available for the desktop and iOS versions (bridges API, network core) and includes Bitcoin, Ethereum, and Litecoin wallets. We believe that this functionality will be useful for developers."