It sounds absolutely great in theory, but in practice it could never work.
Say I want to build a house: As a society, we've come up with mandatory building codes that tell me how to build a house that's going to be safe for everyone.
Suppose we got rid of this regulation for libertarianism's sake.
Most people would still build to code because that's just the smart thing to do but a small proportion of people would build it the cheapest way possible because it is now their god-given right to do so.
When that house inevitably fails at the worst possible time, I don't care too much about what happens to the guy himself. He understood the risk and did it anyways. But in a worst case scenario, he could've been hosting a kids party that day or something.
Now apply this analogy to.. Basically any regulation you'd want to get rid of.
It's kind of always a balancing act between stopping people from killing each other from sheer stupidity, and letting them do and say whatever the fuck they want when they're between their own four walls, and pure libertarianism doesn't allow for that.
Huge companies used to make a lot of stuff back in the golden age of capitalism. General electric was a big chemicals and plastics company for instance. It was just normal.
Nowadays, those mega-corporations make more money acting as a bank than they do selling stuff. They've just kept some product lines rolling because they're profitable and safe.
You couldn't just start a motorcycle company and be competitive against Yamaha. The specific expertise they have took decades to build, so why waste it by closing down those weird branches when they're still making money.