I think the Internet is a lot more easier to shut down, due to the use of phone lines and hard wired connections needed. Amateur radio only needs electricity to operate and can be moved from site to site if needed. Just about the only way is to “fire” some sort of electro-magnetic pulse device or wave[s] to disable it. Many of us Freepers have laid in spare comm gear to communicate with our family & friends in the event of such an emergency.
IIRC, when other governments turned repressive, not only ham radios, but all transmitters were outlawed.
Even possession of a receiver was usually outlawed.
While burst transmissions might help, as would low power levels, the government seems to be in a position to easily control radio frequency comm efforts of the citizens.
If some EE can provide other data, please let me know.