Everyone needs to work, that's the reason.

Mosquitos need to drink blood to breed, malaria took advantage of it. Work is the same way, work can be a good or neutral so long as it's not a given that people will apply for any job whatsoever. The more certain it is that people will work for the worst people at the worst companies no matter how bad things get, then things will get worse with time.

And if the companies making the most money are doing so by taking advantage of their workers in ways that damages workers physical and mental health, by cutting wages and safety, by encouraging workers to break the company rules to get the job done on a schedule the company decided without them, then every other company will need to do the same to compete.

Easiest way to fix this, make work optional. You could technically work from home as a freelancer, you don't have to work at a company. Companies exist to direct clients, to determine the objective of the client, and to get workers to collaborate to complete that objective and delivering it to the client. A company is just a chain linking clients/customers to producers and workers through indirect means, without the workers or producers, there is no company, and the more links in the chain the less efficient the company. So, a freelancer is the most efficient job out there, but you have to connect directly with clients which is harder to deal with.

Chains like these have benefits. Twitch streaming is more popular than direct streaming, because they make it easier to connect with people than a direct connection between streamer and viewer, but mainly it's the payment system. Small donations below $15 can be refunded at a loss to the streamer, leading to people gaming the system and costing a producer of content a lot of money at no cost to the client. Basically trolling. If people do this on Twitch, then Twitch will take the loss instead, and the streamer doesn't have to deal with it. Twitch is also in a better position to deal with people who do this than a streamer who doesn't have time or the automated systems to deal with it and also stream.

In short, companies reduce the non-work a worker would otherwise need to do if they were dealing with the client.

A more complex fix for work would be to completely automate what companies do, and then have all workers become freelancers working for this automated system. So instead of Twitch taking a cut of what you make, or a corporation diverting the income you could have gotten if you'd done the same work alone, you would now be paid almost the full amount while the AI that solved problems you didn't even know existed only takes enough funding to pay for its server costs and energy.