Thanks for have some sense here. Just typing two words is not a comment. It is akin to spam on practically every platform.
It's like censoring someone commenting "It's FBI sponsored" or "Russian propaganda". Sometimes a view words in a context can say as much as a long sentence.
Also in Chinese thinks are a bit more complicated due to how different glyph can be combined and/or used in conjuncture. So I wouldn't be surprised if there is a situation where commenting with a single Chinese glyph is saying as much as a long sentence!
Chinese characters aren't magic. Putting two characters next to each other isn't fundamentally different from putting "Russian" and "propaganda" next to each other. You could write a sentence with just a single-character word, but that's not going to be more expressive than a single word in any other language.