Singapore made these satellites with India's help. That's all. And India builds and operates much advanced and bigger satellites than them. For India, technology used in these satellites is old and useless so we have no problem to give it to our friends. What do you mean? They will work for Singapore. They will be dismantled and will fell in sea after their lifetime is completed or will remain in orbit like Orbital Garbage. Or they also can receive an accident by outerspace factors like Asteroids, Fundamental Forces or radiations. Or movement of celestial bodies. Your questions are pointless man.