So what are you supposed to do against wukong/malphite and yasou comps?

Spread out. Don't let them get a 3+ ult, and definitely not an ult on your backline. If they ult your frontline/get a poor ult, you should be able to turn the fight around.

EDIT: Although to be fair, it is incredibly strong. I used to go Malphite + Yasuo with an IRL friend and the combination of communication + the combo was unreal. We have a 100% winrate with it over 10 or so games. Even works as duo bot.

All I can say is, keep up map awareness, don't get caught grouped by the initiate, or you're dead.

The first step is not admitting instant defeat.

Bend over? Kys?

This is a defeatist attitude. Come on, man, you got to believe in yourself before you can do anything. There's items, there's champions, there's strategies and positioning and map awareness and all these nice things we can do and use. You just got to belieeeeeeeeve.

Perhaps you can try a counter-strategy, perhaps? Balls-deep delivery service? Good luck catching us out of position and cooldowns? Return-to-sender?

Split push, they can't be everywhere. Unless they also have a in which case GG.

Plot push and ward, if they go down 1 lane go down the other 2 with just enough down thier lane to offer resistance (strong wave clear)

I wish people would realize there are other comps out there besides "team fight mid or GG". Split push comps can work very well when you have clearly been out picked in the team fight area.

don't stack on top of each other

Everything everyone else has said is right.

Perhaps having supports like Janna, Lulu, Braum, or Bard could help?

Doran's Lube.

Everyone has it right. Ward and keep good map awareness. Stay spread out to minimize Ult targets. Split push as much as you can and don't go for Baron or Dragon unless you are confident in being able to kill Yasuo immediately or he's not even there. In Yasuo comps, he is usually the big threat, though his teammates can do a lot of damage, they generally have more utility or tank stats than flat out damage. Disengage champions like Lulu, Janna, Braum, and Bard will also help you out tremendously.

Just a tip, never cleanse out of a Yasuo ult. When he's got you suspended, you can cleanse it, but if you do, he'll drop immediately, do the damage, and get the buff. When he's up in the air with you, your team has a full second to lay the hurt on him unless he got a 5-man.

get ...

if they got malphite/wukong top and yasuo mid then all you need is stack armor, thornmail for every team member and it should go easy

Set Yasuo behind if you can, gank him as the jungler or as a side lane if you get a chance to roam, pick someone who counters him in lane or play safe so he can't snowball off of you, QSS/cleanse his ult(the second part of it as it is a suspend rather than a knockup), pick a champion with some sort of CC mitigation. You don't have to do all of that, but it's all stuff that can help.

A very good team comp against that is to have a very tanky team that can survive their burst. And have an ADC with a lot of sustained damage, maybe an azir midlane to both have the sustained damage and to couner yasou in the midlane. On support Leona,Alistar or Tahm. Jungle you might bring someone like Rammus, Yasou, Wukong and their adc won't be able to anything against him. Rammus will also be able to gank Yasou pretty effectively, as his spells can't be blocked by Windwall and for many other reasons. Top lane you can bring something tankier who still has some damage like a Juggernut, Darius is a good option, someone like Volibear or even trundle might do good. If you want to survive and win teamfights against burst compistion the best thing you can do to counter is to have a tanky team with sustained damage. You can go with other tacticts that does not involve teamfighting a very early game focused team so thoose late game teamfighs never happen, a splitpushing comp so they won't be able to teamfight. Or a siege comp with a lot of poke and tower destruction.