These platforms don't exist in a vacuum. Imagine we have a table with four legs. What happens when one leg is too short or too long. It becomes immediately obvious by comparing it to the other legs.

If everyone on Twitter, Facebook, and Youtube is talking about something, people will be talking about it on TikTok. If they aren't, that is noticeable and that too will be something people will talk about. That can actually lead to more attention on that platform due to the Streisand effect.

The primary concern would be if all the social networks censor the same thing, but that isn't a concern here due to the opposing political views unless your concern about censorship is just these platforms not allowing extreme violence, but that isn't what the article is discussing.