Are there many people working in Singapore on tourist visas? Is it easy to get caught?

Singapore entry visa clearly states that it can only be used for traveling and visiting relatives, and it is not allowed to engage in labor, business, study abroad and other activities, which violates Singapore immigration regulations. Once found, they will be prosecuted in court, convicted and sentenced to imprisonment or fine, or both, and then repatriated to China, where entry is prohibited.

Not that it is easy to be caught, but that we should respect the local rule of law and not break the law.