Imagine using this energy for actually productive change, over being angry that you're being slightly inconvenienced.
Pretty much what happened is it wasn't advertised that you would need an epic games account to play the multiplayer, and people are angry about it for some reason. Likely because it's Epic, not because they had to make an account, though knowing Gamers they probably would be pissed about about having to make an account outside of steam too.
And it's funny because the one discord server I usually hang out on that has pretty chuddy people on it largely had a reaction of "Sure it sucks, but there's a lot bigger fish to fry in the games industry."
Yeah basically this; I can't be bothered to make an account for my games. There's a hunting game on steam I want to play but it needs you to make an account somewhere apparently and nope, can't be bothered.