Ethics of a potential collaborator removing another researcher from a project?
There is nothing unethical about this.  You approached a researcher with an idea for a future project, which you both agreed would be a good idea.  However, your employment situation makes it impossible to meet the potential collaborators entirely reasonable demands.  (I would probably not get involved in any research project in which I could not, in principle, have access to the underlying data.  I might never need to see it, but if there is some kind of problem, I would definitely want to be able to look at the raw data for myself and draw my own conclusions.)

Having suggested the research project but been unable to come to an agreement about how it should proceed, you are in a tricky situation.  The other researcher has no obligation not to pursue the project without you or your employer.  I would not consider it a particularly friendly thing to do, but there is no ethical problem.  Your original idea should be acknowledged in the final publications (or whatever) based on this research, but that is as far as your contribution may go.