Purely for show and to keep up appearance. Trying to be good global citizen. Until 1993, they could not be bothered about software piracy. Then one day Bill Gates came to see LHL and Mahathir and promised to retain Microsoft office here as region hub and new office for Malaysia Super corridor. The following month raids on both sides of causeway.
Sand smuggling in now in full swing and Singapore knows that it is helping to breach by abetting the trade. No choice, survival.
I have seen some of the most colourful birds and mammals at Barter Trade, better than The Zoo. They come from Borneo, Indonesia and the Philippines. All wonderfully guarded by Singapore Police and Customs for export. No Singaporean allowed.
If Singapore wanted to, all the wildlife smugglers will be behind bars. They can't be bothered because it is not in Singapore's interest. Try smuggling pork into Singapore, AVA will be on your arse double quick. Consumption of diseased pork will be a local political liability.