Hils wrote:

Ofcom are unlikely to take action unless they cause interference to
licensed users (eg aeronautical). Though I wonder if that would change
if instead of sweary trawlermen or the popular music playlists of
teenage nerds, the transmissions were focussed on political dissent.

In the US, dissenters can buy time on 100kW shortwave broadcasters.
They go by pretty much unnoticed.