This is going to sound controversial but I don't think Kiwi Farms is wrong about them dunking on a voice actor for wanting better pay because much of America's entertainment industry is made up of lefty activists that don't understand economics. Unless they're Mel Blanc, historically voice acting has been seen as a thing being done by D-list tier celebrities that don't understand how economics really works.
The generic troon arguments aside, I don't think Kiwi Farms is wrong on this and they're just arguing about this poorly. So when people think they want to be successful then they think hard work is the key to this when that is not necessarily the case, the real key to success is to do valuable work and take advantage of opportunities. Part of the reason why people point to STEM fields (like in tech) is because that may lead to jobs that are more likely to lead to success so even if you get a low effort entry level job in that you're still likely to be valued. Not only that, you have to be able to capitalize on the skills that you are good at. Even in the arts like the entertainment industry, there are still plenty of great opportunities to be successful. Being a video editor is not a STEM field but if you're a good video editor then that can take you a lot of places but if you give up on an opportunity to be a video editor for someone like The Game Theorists or Markiplier or James Rolf then you're just letting success pass you by.
Don't get me wrong, hard work is needed to be successful and it's something that you should expect to do (you have to put effort in something). But no one is going to pay someone a six figure salary to pour a glass of water because that is something anyone can do and if they don't then they can easily learn. I don't care if someone has been doing something for years if the work in question they're doing isn't valuable. Remember, a pile of gold is going be much more valuable than a pile of worn-out clothes.
I don't think Kiwi Farms is wrong in this regard, they're just arguing about it poorly which can lead to a classic Fallacy Fallacy.