An authoritarian government needs excuses too. China even claims to be a democratic country. North Korea even has the word Democratic in its name. "Protecting children" is a common excuse China uses. https://en.wikipedia.org/wiki/Very_erotic_very_violent is a famous example of them trying to justify internet censorship under the name of "protecting children".
Has anyone tried Marvin from The Hitchhiker's Guide to the Galaxy? "Here I am, brain the size of a planet, and they ask me these silly questions." Could be fun.
HTML is a markup language, not a programming language. It's like asking why Markdown can't handle includes. Some Markdown editors support them (just like some server-side tools do for HTML), but not all.
Because Duolingo is perhaps the most well-known language learning app right now, people call their apps 'alternatives to Duolingo' regardless of how much they actually have in common.