That's a depressingly plausible thought.

The company or government that will do this will be so large and powerful that it will be very unlikely some minor competitor will be able to attack them.

More likely scenario is that after someone moves a multi trillion dollar rock into earth orbit we will start a world war over its control.

This is why the US and France made space force.
It is analogous to why the Portugese and then the Britsh had had the largest navies.

The value of a nations currency is in part the ability to guarantee transactions. Sometimes at the end of a barrel.