Why, do you think that the US, where all the giant social network companies are based, isn't doing this on a massive scale, much larger than anything Russia or Iran (and probably China for now) could ever hope to do?
Hell, look at Twitter/X. It got acquired by a mental guy who was screaming about government propaganda and censorship (while doing Nazi salutes). Do you really think that if there was any government mandate to do anything like what the Russians are doing, he wouldn't have exposed it as "SEE, I TOLD YOU BIG GUBIMNT BAD!!" ?