RT was heavily censored in the USA and is banned in several European countries. Press censorship is pretty much the norm in 'western democracies' similar to everywhere else.
Source?
Again, source?
How heavily has RT been censored in the USA? Has the government ever censored it or pressured others to censor it, or is it just that links/rebroadcasts have been dropped by private entities of their own volition?
It hasn't been. Probably more accurate to state that when it was carried on cable media they broadcast a bowdlerized version. Al Jazeera did the same thing when it was carried by cable/satellite in the US: https://en.wikipedia.org/wiki/Al_Jazeera_America
This was the RT channel you're probably thinking of: https://en.wikipedia.org/wiki/RT_America
Really?
I am a long way away, but I thought the constitution prevented that
All countries are on a spectrum, there is no clear line between shiny democracy and brutal dictatorship. They all have institutions that look similar on the surface. A democracy is not going to stop having a police force just because some police states also have one, for example.
So yes, some democracies ban some media spreading propaganda for foreign interests, but the details matter.