X and Meta do try to uncover and scrub malicious state actors, like the investigation of the 2016 Russia misinformation campaign. Maybe, they could have done more, but there is no reason why they wouldn't put an earnest effort as they have nothing to gain from faking compliance. A social media platform owned by a foreign adversary does have this incentive.

It also of ingores the cases where state actors' and some wing of domestic politics have aligned interests (USSR & Communist parties in the early o mid 20th century, or Russia sponsoring/infiltrating rightwing countries in Western Europe & America in the 21st century)