The cryptocurrency world is indeed a place full of risks and opportunities, where many people are looking for opportunities to make money. The four types of people you mentioned basically summarize the main players in this field:
Exchange operators: As you said, they are similar to people who run casinos. They earn income by charging transaction fees (commission model), and they may also profit from traders' liquidation (betting model). This role does have great profit potential, but it also comes with high risks and the need to deal with a lot of regulatory, technical and security issues.
Issuers: These people or teams create and issue their own cryptocurrencies, similar to listed companies in the stock market. Their main goal is to raise funds, which is usually achieved through an initial coin offering (ICO) or other similar mechanisms. However, unlike listed companies, the value of cryptocurrencies tends to be more volatile and lacks a mature regulatory framework.
Miners: They use computer hardware to verify transactions and maintain the security of the blockchain network. In return, they receive newly generated cryptocurrency (i.e. mining rewards). Some miners choose to sell their rewards on the market for a profit. This is a capital-intensive business that requires a lot of electricity and hardware resources.
People who provide mining equipment and services: These people sell mining hardware (such as ASIC miners) or provide mining-related services (such as mining pools, cloud mining, etc.). As the popularity of cryptocurrency mining increases, this market is also growing.
The field of contract trading is fraught with high risk. Contract trading allows traders to use leverage to magnify their gains (or losses), which means that even small price fluctuations can result in large losses. Therefore, many experienced traders also recommend using leverage with caution and emphasize the importance of risk management.
In general, the cryptocurrency world provides a variety of opportunities to make money, but each opportunity comes with corresponding risks. People involved in this field need to fully understand what they are doing and develop a reasonable risk management strategy.
