Brandbucket domain submission concern

Hi there first post here. I’m new to domain investing. As many of you know Brandbucket accept submission of both registered and unregistered name, what stopping them from stealing your domain name idea if they are not registered? Let say that when evaluating name, an employee think this name is really good, but it is not registered, he/she rejected the name and registered it for themselves. I read somewhere that about 20% of all name on Brand Bucket are owned internally. Only 1 in 10 of all name submitted are accepted so it doesn’t make sense to register them all. Hope someone can help me clarify this. Thank you all very much