Anybody else wanting to get there would have to get permission.
The USA, China, and Russia have all successfully tested anti-satellite weapons. If anything, any company that operates a constellation of space-based data centres would need 'permission' to keep them working.
beside of how easy it is to destroy from orbit the anti-satellite missiles coming out from the atmosphere, you're probably missing the fact that any object in orbit is basically a warhead with TNT equivalent of at least 6x its mass. For example the 150 tons payload of just one Starship will have close to 1 kiloton TNT equivalent - 5% of Hiroshima - if dropped from orbit.