The Terrarium TV app is (was) legal in India and other countries across the globe. However, since it holds pirated versions of original content, it’s a violation of Copyrights. Terrarium TV is a third-party app with third-party videos and thus separates itself from being an illegal platform. It’s therefore completely legal to use in India and other countries. But watching Copyrighted material is illegal, and this is where you can find yourself in trouble. If you’re caught streaming content that’s not original or paid-for, then, depending on your region, you can be subject to penalties and, in some cases, imprisonment.