Let's look at this from and angle that makes sense. First, the possible interactions between companies conducting aerospace operations and those that are not.
1) Company A is conduction aerospace operations. For the sake of the example, let's assume they're making a profit. Company 2 has no stake in AS operations, and their profit is therefore not affected. Neither company has a reason to restrict AS access and/or usage. Yes, Company A has a monopoly. No, it does not make sense to alienate the customers. No restrictions.
2) Company A is conducting AS operations. As above, assume they're making a profit. Company 2 is also conducting AS operations, but is being out-done by Company A. This provides a motivation to compete, furthering progress. Neither side can afford to alienate customers. No restrictions.
3) Neither Company A nor Company 2 are conducting AS operations. There is no competition, and no customers. By virtue of not being involved, neither company is restricting anything. No restrictions.
So, what happens if a company has a monopoly and decides to go the "Hey, let's be dicks and restrict this stuff!" route? Quite simply, they go out of business, and somebody who has a more business-savvy CEO and/or governing board rakes in the cash.
What happens if there is no other business-savvy CEO and/or governing board to rake in the cash? The company flops, gives up space exploration, and the point is now moot for someone else to fill the void.
What happens if no one fills the void? There are no restrictions on AS operations by virtue of there not being AS operations.
EDIT for me being forgetful: What happens if there is no profit being made? Some entrepeneurial spirit either finds a way and the options above enact themselves, or there is no private sector AS operations. Which means no restrictions.
Seriously guys, critical thinking skills.