When South Park changed over the years, they’ve gotten more realistic and less of a fantasy. From the movie, all of the “doom and gloom” (like Saddam Hussein and Satan taking over the world, a war against Canada over a movie, the censorship of a vulgar movie) is way too much of a fantasy and very laughable. In reality, Canada’s biggest industry is their logging or lumber industry, which doesn’t even take up 20% of their economy. The arrest of two comedians wouldn’t provoke a war. And why would a deceased dictator come back to life and haunt the world (not to mention, Saddam Hussein was just as much of a laughing stock as he’s evil in the movie)?
In stark contrast, the subject matter in South Park’s 20th season was serious and realistic, which makes it scarier than the movie. Cyberbullying is a real threat, especially if they went as extreme as Gerald did, but so is the invasion and leak of everyone’s private information (which is TrollTrace’s plan). And Lennart Bedrager, the CEO of TrollTrace, has no laughable or lovable qualities like their depiction of Saddam Hussein. With the exception of the fact that leaking everyone’s private info would start a world war (which is an exaggeration rather than reality), the idea of your private emails and messages being shared with others through third-party means is more realistic than a war over a movie (and is realistic and scary). And so are the consequences (like job losses, relationship strains, and assault from cyberbullying victims).
It doesn’t stop here. The other subplot from Season 20 was about the 2016 Election, which was ongoing at the time new episodes aired. While the Memberberries are a fantasy, their scheme, as well as how they portrayed Trump, was realistic, and we’ve seen what happened when Trump got elected.
So yeah, South Park’s 20th Season had some realism-induced horror and a more serious villain, while the movie was a poorly-written fantasy with distorted facts.