This should be a WTO principle or something: you’re only allowed to sell products/services to foreign countries thay you allow to circulate internally and on similar conditions.
Did you mean Voice of America?
VOA is forbidden to broadcast within the United States by the 1948 Smith Mundt-Act, Section 501
https://en.wikipedia.org/wiki/Smith%E2%80%93Mundt_Act#Excerp...
Because the presence of regulation suggests at least some vector for the regulated thing doing harm. Wantonly exporting something tightly regulated in its place of origin implies that the government is aware of its potential to do harm, and sells it anyway without the regulatory guiderails, which is a shitty thing to do.