From what I know, most videos like TED Talks don’t actually need special government approval before they go online, at least in countries like the US or UK. There are rules they have to follow, though. Stuff like copyright, privacy, and defamation laws apply just like they do to anything else on the internet. If a video breaks those laws, the government can ask the platform to take it down or even go after the people who made it. But you don’t need to get every video checked by someone in a government office before it’s uploaded.

Now, it’s totally different in some countries. In places where the government controls the internet more, like China, yeah, they’ll block or ban stuff that doesn’t fit what they want, especially if it talks about things that challenge the government or talk about freedom. It’s kind of wild thinking some awesome videos that seem pretty chill to me could get someone in trouble somewhere else. So yeah, it all depends where you are, but in most places you can post educational videos without asking first!