TLW was my first exotic, got it as a nightfall reward. I didn't earn it, I had barely been playing the game a month and I got carried through by a friend. There is no earning in this game, there is only random chance, I have several vog and crota completions but not nearly as much as some, that being said I've received exotics that player with almost double my grimoire and over double my play time may never get. It's random, this earning nonsense has to stop at some point.