Space is limited and we share it whether we like it or not. In case of physical landmass we have borders. But in case of seas we have international treaties t

Space is limited and we share it whether we like it or not. In case of physical landmass we have borders. But in case of seas we have international treaties that describe sphere of influence of each country and what they are and are not allowed to do depending on some very arbitrary rules. If you think about it, most of Earth surface is actually shared between countries, ie. there is not single country having exclusive access over it. In case of electromagnetic spectrum we have other international treaties where countries agreed on how to share it so that they don't step on each other. I don't understand why you don't like the word "share" since we are already sharing so much.