Regulations in the countries

Roulette, as well as other forms of gambling, is illegal in some countries due to various gambling laws. Qatar has one of the strictest gambling laws and all forms of gambling are considered 100% illegal, including sports betting. The ban was so sweeping that it led to the emergence of an underground gambling scene.

Lebanon also bans citizens from engaging in any form of gambling, and the government actively blocks all gambling activities, including online sites. There is an exception, however, which includes an online casino and a government-controlled brick-and-mortar operator.

Most forms of gambling are illegal in Thailand, meaning neither roulette nor casinos are open to citizens. Likewise, locals in Singapore are not allowed to play roulette for money in casinos, but foreigners can play in resorts.

No regulation for roulette in this countries

Research by roulette.casino where this game is banned yields the following:

In Thailand, most gambling activities, including roulette and casinos, are prohibited by law for citizens.
In Singapore, local residents cannot play at roulette tables in casinos. Only foreigners are allowed to gamble at resorts.

In Japan, only a few approved casinos are allowed, and roulette is not offered to locals. Gambling is generally not a big part of Japanese culture.

In China, roulette, along with other casino games, is banned with the exception of state lotteries. Macau is an exception, but usually locals are not allowed to participate in table games.
North Korea keeps a tight rein on its citizens and bans all forms of gambling, so roulette or any other entertainment at the tables is also not allowed there.

The legality of gambling with Bitcoin or other cryptocurrencies varies from country to country due to a combination of factors:

In some countries, cryptocurrencies like Bitcoin are recognized as legal tender or a legitimate form of asset. These countries are more likely to allow gambling with Bitcoin. However, where cryptocurrencies are either banned or not recognized by the government, using them for any purpose, including gambling, may be illegal. The legality of gambling, in general, differs widely is highly regulated or completely prohibited. If gambling is illegal, then by extension, gambling with Bitcoin is also illegal. Conversely, in countries with legal and regulated gambling industries, there might be provisions for the use of cryptocurrencies.

Some countries have clear regulations regarding the use of cryptocurrencies, including their use in gambling. These regulations can include anti-money laundering (AML) and know your customer (KYC) requirements. In countries where such regulatory frameworks are lacking, the use of Bitcoin in gambling can be a grey area. Governments that strictly control currency flows, including exchange rates and cross-border transfers, may prohibit Bitcoin gambling as it can bypass these controls. Additionally, the challenges in taxing cryptocurrencies could lead to restrictions in their use for gambling.

Bitcoin and other cryptocurrencies are often associated with high volatility and security risks. Some governments may restrict their use in gambling to protect consumers from these risks.