Why is there no lock-up period for the owner's shares?
How do you prevent your team or employees to directly withdraw their stake and leave the project?

This is a good question. The situation is similar to the Ripple Foundation. There is no intention for the owners/promoters to flood the market with EcoBit tokens. The EcoBit team intends to keep the supply of tokens on the market at a limited amount.
You still did not answer my queries. Where are the other ecobit team members?
are they just crypto newbies and don't have a BTT account?

other ICO projects are much better since their members are actively engaging with the public and investors.