Lol, YouTube has lots of shows and obviously none is legal unless uploaded by the TV station itself. It is just a matter of time before the production company or TV station starts to request for the videos be removed or even take legal action. And some people might just be using it as a channel to upload the videos since any legal issues would most probably implicate YouTube first since they are the hosts... and if I not wrong there was already a lawsuit against YouTube related to TV shows from some country where the TV station complained.
More importantly, Mediacorp has a
MOBTV service where you can view their local productions so that would make the uploading of their shows even more unjustified. Anyone who wants to watch their productions should also show their support by subscribing for the service if they have missed any single episode.