Let's talk about GM Sub-zero matchup and how it is butt chicks and how i think it should be played. I mean, i don't have an amazing tech, that will magically make it your favour, but rather a basic strategy, that'll make it less frustrating and more entertaining.
Sub-zero can place his clone safely right in your face and there is not much you can do afterwards. d+f+1, jump over 3 or some yolo stuff like glow kick. I don't really like those options. His clone is taking care of her best tools like b1 and great pokes. The general in your face nature of this character is getting toned down by lots. On top of that, you get hit once, congratulations, you live in the corner now.
So what i'm doing now is backing off, like staying full screen at all cost, camping interactables just in case i need to escape. I know, it sounds childish and stupid, well, because it is. But from full screen Sub Zero can't do shit. Like 0% damage. His projectiles are easy to avoide. He throws iceball at you - jump forward ~ air guns, he throws his icy friend at you - jump back ~ air guns. Just annoy him, make him come to you. It might take some time, yes, and the strategy that relies on your opponents emotinal state is not the best strategy, obviously, but you wouldn't believe the things i saw some of them,even skilled ones, have been doing. Jumping around like on a pogo stick trying to catch me, running in into slide, like everything they could think of, because most of them don't have a plan B ready for you.
So, yea, the plan is not to win a game by doing nothing, but projectiles, it just won't happen. The plan is to stay away from clone (especially if you have a life lead) and make him do some stuff uncharacteristical for SZ.
This won't make this matchup easier, but it is way better than getting frozen by his clone in a poking game, getting anti-aired by clone or just straight up running into his clone. Try it out.