I think the comment was more along the lines of “did they block it because it purports to be education for children but it’s actually propaganda” which was last year’s “YT is evil” story :D
Censorship is always negative.
There is a point behind prohibiting "just about everyone" from having access to easy gunpowder. Consider how "just about everyone" includes anything from anti-social prankers to vengeful people with no concern for collateral, to plain `terrorists`.
Gunpowder isn't some super secret formula. Anyone with basic chemistry knowledge can make it. I remember kids making it in high school chemistry class to make a black powder rocket.