The main disadvantages of competition in business are related to the fact that competition between individual companies, in fact, does not solve global human problems.
What is the most important thing in the world? What is the biggest goal? This goal can be formulated as follows - to save humanity as a species.
To do this, it is necessary to implement large technological infrastructure projects. In practice, such projects are carried out either by the state or by individual passionate individuals, like Elon Musk.
In any case, this is not related to competition between individual companies.
It’s not always a big risk and something to dream just because you are working towards making the world a better place for humanity. Elon Musk took over Tesla when it was already a profitable business as long as you could have invested into it, in the sense that there were a lot of people willing to buy the cars but there wasn't enough money to build it into what it is today as investment so it took time.
The original creators (some think Elon built it, he did not, he joined later, he is not the founder) could have done a much better job than him if they had money, but they didn't, so Elon just bought them out, invested billions on their work, and made the profits easily.