Lol, have you not read the news that Muslims in Oz/NZ were trying to get KFC there to become halal? They claimed they can't eat KFC even though only chicken is served simply because it is not halal. They were even considering lodging a discrimination complaint.
With SG's Muslim population at over 15%, I am sure no major businesses are willing to risk being tagged with the racist label when Muslims start screaming discrimination. Just imagine the trouble they can cause when the small percentage in angmo lands are already giving authorities a headache.