A "remote gambling" bill filed in parliament yesterday will give the government broad powers to block access to the websites as well as blocking electronic payments to their operators.
"The objectives for regulating remote gambling are to maintain law and order and protect young persons and other vulnerable persons from being harmed or exploited by remote gambling," the home affairs ministry said in a statement.
Singapore currently bans access to about 100 websites, mostly featuring pornographic, extremist and hateful content. Access to extramarital dating site Ashley Madison is also banned in the city-state, which is famous for strict social controls.
Exemptions will be granted for locally-based online gambling operators that follow strict rules and operate on a non-profit basis.
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Government-linked betting firms involved in sports betting and horse racing channel proceeds to charity and social causes.
Media and technology experts say blocking overseas websites will have limited effectiveness.
"There is VPN, and so the most effective method is not through blocking sites," said Ang Peng Hwa, a media law professor at the Nanyang Technological University.
"I believe blocking will at least keep out those casual gamblers or those who just chance upon the websites," Siew said.
"Whether it is pornography or any other kind of objectionable content, if the person is hardcore enough, he will find a way to access it," he added.
Noel Biderman, the head of Canada-based Ashley Madison which enables married persons to have affairs, has said over 5,000 Singaporeans have signed on to the portal using VPN, bypassing the government ban.