Which law states that speculation is not allowed?

Although there is no clear legal regulation against cryptocurrency speculation in the country, the state prohibits it and has cut off capital inflow and outflow channels. Speculating on cryptocurrency is purely a personal investment behavior and will not receive legal support; individuals must bear all risks and returns on their own.
For investments in projects like Sun's cut, people are harmonious when making money and curse when losing; this is similar to homebuyers vandalizing sales offices when house prices drop. The state has repeatedly prohibited cryptocurrency speculation; seeking help from the government to recover losses after losing money is unreasonable, and there is no legal support for cryptocurrency trading losses domestically. We should protect our own wallets.
Some believe the cryptocurrency space is a big scam; however, if it were truly a scam, why would it have existed for so long? Moreover, countries like the United States, Russia, and South Korea strongly support the development of virtual currencies, indicating that the cryptocurrency space has its value. We should recognize both its dangers and advancements. For example, the innovation and progress of blockchain technology occur within the cryptocurrency space; the essence of blockchain is decentralization, which requires more nodes to participate, and participation needs incentives, i.e., tokens, which can be exchanged for cash. This is how the ecosystem of blockchain projects can thrive, innovate, and decentralize.