The key to better working conditions is to move up the value ladder (precisely the thing that the West is trying to prevent China from doing). The system was setup to benefit the rich and to allow capitalist elites (particularly Western elites) to abuse the labor of other countries while keeping them poor. You can't just "legislate" away this inequity because it is built into global trade - 90% of the world competing for 10% of the scraps.Yeah, the work is definitely super hard and stressful when you are in competition with hundreds of millions of people, but the thing is that many of these people has no better option, farming might be easier, but you make significantly less money. People love to virtual signal about not buying Shein and stuff when it's not going to help these workers at all, Shein's margins are not high anyways and if they gave all their profits to workers the wages won't even go up that much.
Also, these workers make around 10k USD a year which is higher than 70% of the planet. If people want a better fairer economic system, the west would be required to give trillions back to the developing world and that's not something they would do.
Ironically, it's why it's so difficult for the US to get manufacturing back, despite Trump's best efforts. They're choking on the very system they built and there's no way to change it without giving up their wealth & privilege, which obviously, they refuse to do.