Here's my story from an Australian market perspective.

Any and all money that comes into my business can be used to further grow that business, vastly increasing the chances I can produce more income that I and I alone take advantage of. A simple example of this is being able to take $50,000 of revenue and experiment with an idea before tax ever touches the cash. As an employee, you're taxed first on the $50,000 and then you get to experiment (with less money.)

It's worth noting that as an employee you pay taxes then pay expenses. As a corporation you pay expenses and then pay taxes. It's far more efficient. Here's a real-world example of this in action...

I earn AUD$1,000/day on average as a senior DevOps Engineer here in Brisbane, Australia.

As an employee I'd push my tax bracket into the 45% range with those kinds of earnings. That's a lot of money going into the system. That's possibly a good thing or a bad thing, depending on your world view (I'm pro taxes.)

As a business I can pay my self just $400 per day from that $1,000 - $75,000 per year, roughly - which would put me into the 32.5% tax bracket, and with the rest, $600/day, I can pay a fixed 27.5% corporate tax on it (which is going down to 25% soon.) I can then push this out to a trust with franking credits, which in turn can distribute it to another company along with the credits. That company pays 0% on the income due to the franking credits. It gets more complicated from this point onwards, but essentially I can cap the tax of the remaining $600/day at 27.5% (25% soon) and then invest what's left into shares and other vehicles, allowing me to have more money to invest with.

The more money (and time) you have to invest with the more money you can make (and lose.) That's why leveraging (margin loans) is a thing.

The business might take a different approach: pay me $400/day in wages and push $300/day in some wild ventures, like paying someone to ghost write a book for me; produce some videos for a YouTube channel; develop a product prototype; and so on. Of course the $300/day is pre-tax and never will be taxed. Not only that but as more money comes in from those ventures, I can dump and pump them back into those ventures to keep scaling them up, making more money and eventually pushing profits into the trust on the side, as above, and it's all capped, never reaching that 45% tax bracket until I'm ready to draw it down from the trust (and by then, I'll likely be drawing down the $400/day, allowing me to FI/RE and therefore will still remain at the 32.5% tax rate.)

In essence, I can hire people; create jobs; produce value; and more, as a business versus being an employee, due to the tax implications. An employee can do these things too, especially on $1,000/day, but with less impact and higher taxes on the proceeds.

Being an employee is fine. It offer a safety net. You get benefits. A team to work with that's consistent and all on the same page and rooting for the same business and solving the same problems, together. As an employee the world is still yours to shape and improve. But as a business (and an employer), the world is mine to shape also, and I have way more resources to do so than you do.