Seconded. I'm about 9 months into revanced after vanced got shut down and its virtually identical. 15 min install with easy step by step guides to enjoy the good youtube has to offer without all the shit.
Also you can add or remove features you like/dislike which is a big benefit.
I would have no clue. I would imagine if you wanted to do anything like revances on iOS you would need to start with a jailbreak first then maybe a sideload?