Why it's so that at the time of cash out these fees and stuffs are deducted.Is it necessary?
Everything is not free you know. I think that fee is for the miners as well for their hard work of maintaining the system.
All things had its corresponding price and as you said theres nothing free on this world already. They do need money for the sake of profits or even just a little pay for their service that they do gave ex. miners, and if you are running a business then you would normally charge up small fee too because on this way you would able to make money.On my side this thing would really be necessary and no people would really make things for free or they wont make any benefit.