It is illegal and immoral. You have requested a government subsidised flat because you need it and would not be able to afford one otherwise. The government has

It is illegal and immoral. You have requested a government subsidised flat because you need it and would not be able to afford one otherwise. The government has determined, after some research, yes you do need one of their flats. If you’re subletting it then it’s obvious you don’t need it. You’re staying elsewhere, someone is paying you to stay in your place, and the long list of people who really need it remains full.