It's been known to happen. The workers do the actual "creating." Of course, there would still need to be someone to fulfill management and administrative functions, but they can be elected from among the workers. The state could also help to guide them.
This would be detrimental for competition, which in turn would kill innovation and disruptive tech.
Starting a company, especially in spaces where companies are already operating, is very risky business. The state wouldn't just hand out money to anyone with an idea. This money is taxpayer's money and the state is expected to handle that with care. They would not just hand it out to any person with some risky idea. Especially not if they face an uphill battle in terms of competition.
If you want to start a new car manufacturing brand, the state would consider that too risky + they'll say "we already have tesla, ford, general motors..."
But if you have a billionaire investor, or are a billionaire yourself, you can go ahead anyway with your private funds and enter that competition and innovate.
That in turn, if you do a good job, keep tesla and the others on their toes as well... Because they'll need to make sure they stay ahead in whatever innovation you can come up with and be sure to stay competitive.
This is how capitalism drives innovation and progress.
If your starting and operating capital comes from the taxpayers, the state isn't going to be very forthcoming to take such risks.
It would be a conflict of interest also. Because when they hand out money, they become a stakeholder in that company. Now a competitor comes along and ... the state becomes a stakeholder there also? So if one outcompetes the other, no matter which one, either way the state loses money...
This is why things are not practical and detrimental to competition and innovation.
This is why the free market and private funding is so important.
The only reason the US won the tech race to the soviets, is precisely because the economic system of capitalism motivates competition and innovation, while more communist style systems tend to prefer the status quo, or at least move a lot slower in terms of progress - they don't have this drive to make sure to stay ahead of competition, because there is no competition.
For all intents and purposes, the function of "business owner" is essentially that of "business manager."
And risk taker and financer.
The owner can always hire someone to run the business, which would make the manager, just another worker.
The owner would first require good amounts of money to do that.
And even then, the owner would not just let everyone do their thing without being involved.
He'ld still keep an eye on everything and steer the direction and whatnot.
If you would start a company and burn through a bunch of cash to do so, would you then just step aside and just assume the people you hired will keep it afloat and profitable? I sure wouldn't.