1. Consumer Behavior Requires It
2. Large Companies Thrive On Regulation
To point one, if you have anything that is making people a lot of money one way or another, there will be scams and fraud. Once there are scams and fraud, the government gets involved and has to clean up the mess. Then laws are made to stop the problems from happening in the first place. Eventually you need business licenses, certification, etc. to transact business because too many people got ripped off.
To point two, regulation and rules actually end up favoring the entrenched companies. Usually regulation creates barriers that reduce competition. For example, to trade securities, sell insurance, or sell real estate you need to get a license. To get a license you need to take exams and pay money to be certified. Most people won't go through that effort and so the larger companies make a lot of money from the lack of competition.
Rules and regulations might be annoying, but they are a sign of maturity and growth in many cases so it's not all bad.